magestyx

Sure – here you go:
https://booster.io/features/woocommerce-multicurrency-currency-switcher/

The mfunc code is output by the PHP via the shortcode. We’re using Elementor for building the pages so we’re not doing any direct editing of any PHP theme files. So there’s no place we’re adding new code inline in any PHP. That may be easier ultimately, but I’m not sure how we’d do that building everything with Elementor blocks.

Ok we finally got something working, but it’s well short of a full solution.

We setup a new shortcode so that the ‘final’ shortcode is wrapped like: [shortcode_wrapper shortcode=”all_tracking”]

The shortcode does (again, all <> are = so the code will display here):
$content = ”;
$shortcode = $atts[‘shortcode’];
=!– mfunc FRAGMENT_CACHING –= echo do_shortcode(‘[” . $shortcode . “]’);=!– /mfunc FRAGMENT_CACHING –=
return $content;

This is confirmed working.
BUT, the Product Price is an elementor woocommerce widget block. How do we apply this fragment cache to them?

• This reply was modified 6 months, 2 weeks ago by magestyx.

Update:
One of many alternatives we’ve tried is (spaces between & and # added so the characters will display here):
echo do_shortcode(‘& #91;all_tracking& #93;’);

The encoded brackets are saved to the cached file, though, so when do_shortcode happens it still can’t find a shortcode with that name – so the final output is simply [all_tracking]

• This reply was modified 6 months, 2 weeks ago by magestyx.
• This reply was modified 6 months, 2 weeks ago by magestyx.
• This reply was modified 6 months, 2 weeks ago by magestyx.

For us it ended up being a setting in the Really Simple SSL plugin. It has a specific setting to ‘disable anyone can register’.

Did you solve this? We’re having this issue on a site as well and it’s unclear why it’s happening.

At last, we -FINALLY- have solved this issue.

As mentioned, we use Apache and nginx, so we have rules/directives set in htaccess and also in the nginx configuration to set the cache-control for files.
This block in nginx is what was conflicting or preventing W3 from creating the minified files:

location ~* .(css|json|js)$ {
expires 64d;
add_header Cache-Control "public, max-age=10367998, s-maxage=10367998";
add_header Access-Control-Allow-Origin *;
add_header Vary "Accept-Encoding";
log_not_found off;
access_log off;
etag off;
if_modified_since off;
add_header Pragma "public";
}

Even if the block is 100% empty, it still causes the issue. The very existence of the “location…{}” prevents any minified files being created.

With that gone – bam – we’re back in business and W3 and the sites are working great. Whew!

Hi, Marko.

1. /minify manually deleted
2. http2 push disabled for JS & CSS minify
3. Saved Settings & purged cache
4. result: same issue – all JS & CSS broken in frontend. (/minify was recreated on the server automatically with the .htaccess file in it, though.)

The duplicate cache-control rules are there for some separate testing we’re doing.

All of these sites are using PHP 8.1.21 with PHP being run as an FPM application served by nginx. But to try to get W3 minify working, we’ve also tried them as FPM through apache.
There is also a special nginx caching level, but we’ve tried that both off and on – no difference.
We’ve also tried limiting what files nginx serves, like gzip for example, but regardless of that setting there is no minify.

The nginx.conf contents is below. Every time we made changes we checked this file, and previously there was a specific /minify section at the top, but now it’s not there whether or not minify is actually on.

Like I mentioned, this has been so difficult to troubleshoot because we have the same settings on all these different sites – same server and w3 settings – and it’s basically been random when a site stops minifying and never does again. We now have minify off on them all except 2 last ones. So at least they’re almost all acting the same at this point, but they all started off working with minify then at some point we’d do a Save Settings and Purge Cache and that was it – no more minify ever.
We’re set to do standard updates to the remaining 2 next month so we’ll pay close attention to them if at some point they suddenly stop minifying. Currently they’re already on the same settings as the others were, though. pdcamarketing.com and bluesageconsulting.com in case you want to review them.

Thank you.

BEGIN W3TC Minify cache END W3TC Minify cache BEGIN W3TC Page Cache cache END W3TC Page Cache cache BEGIN W3TC Browser Cache

location ~ .(css|htc|less|js|js2|js3|js4)$ {
etag off;
if_modified_since off;
try_files $uri $uri/ /index.php?$args;
}
location ~ .(html|htm|rtf|rtx|txt|xsd|xsl|xml)$ {
etag off;
if_modified_since off;
try_files $uri $uri/ /index.php?$args;
}
location ~ .(asf|asx|wax|wmv|wmx|avi|avif|avifs|bmp|class|divx|doc|docx|exe|gif|gz|gzip|ico|jpg|jpeg|jpe|webp|json|mdb|mid|midi|mov|qt|mp3|m4a|mp4|m4v|mpeg|mpg|mpe|webm|mpp|_otf|odb|odc|odf|odg|odp|ods|odt|ogg|ogv|pdf|png|pot|pps|ppt|pptx|ra|ram|svg|svgz|swf|tar|tif|tiff|_ttf|wav|wma|wri|xla|xls|xlsx|xlt|xlw|zip)$ {
etag off;
if_modified_since off;
try_files $uri $uri/ /index.php?$args;
}
add_header Referrer-Policy “no-referrer-when-downgrade”; END W3TC Browser Cache BEGIN W3TC Minify core

set $w3tc_enc “”;
if (-f $request_filename$w3tc_enc) {
rewrite (.*) $1$w3tc_enc break;
}
rewrite ^/wp-content/cache/minify/ /index.php last; END W3TC Minify core BEGIN W3TC Page Cache core

set $w3tc_query_string $query_string;
if ($w3tc_query_string ~* “^(.?&|)_branch_match_id(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)_bta_c(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)_bta_tid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)_ga(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)_gl(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)_ke(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)adgroupid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)adid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)age-verified(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)ao_noptimize(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)campaignid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)campid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)cn-reloaded(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)customid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)dm_i(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)ef_id(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)epik(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)fb_action_ids(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)fb_action_types(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)fb_source(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)fbclid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)gclid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)gclsrc(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)gdffi(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)gdfms(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)gdftrk(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)hsa_acc(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)hsa_ad(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)hsa_cam(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)hsa_grp(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)hsa_kw(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)hsa_mt(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)hsa_net(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)hsa_src(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)hsa_tgt(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)hsa_ver(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)igshid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)matomo_campaign(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)matomo_cid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)matomo_content(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)matomo_group(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)matomo_keyword(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)matomo_medium(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)matomo_placement(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)matomo_source(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mc_cid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mc_eid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mkcid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mkevt(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mkrid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mkwid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)msclkid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mtm_campaign(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mtm_cid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mtm_content(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mtm_group(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mtm_keyword(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mtm_medium(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mtm_placement(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)mtm_source(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)pcrid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)piwik_campaign(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)piwik_keyword(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)piwik_kwd(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)pk_campaign(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)pk_cid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)pk_content(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)pk_keyword(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)pk_kwd(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)pk_medium(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)pk_source(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)pp(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)redirect_log_mongo_id(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)redirect_mongo_id(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)ref(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)s_kwcid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)sb_referer_host(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)si(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)sscid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)toolid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)trk_contact(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)trk_module(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)trk_msg(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)trk_sid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)usqp(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)utm_campaign(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)utm_content(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)utm_expid(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)utm_id(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)utm_medium(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)utm_source(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ “^(.?&|)utm_term(=[^&])?(&.|)$”) { set $w3tc_query_string $1$3; } if ($w3tc_query_string ~ ^[?&]+$) { set $w3tc_query_string “”; } set $w3tc_request_uri $request_uri; if ($w3tc_request_uri ~ “^([^?]+)\?”) {
set $w3tc_request_uri $1;
}
set $w3tc_rewrite 1;
if ($request_method = POST) {
set $w3tc_rewrite 0;
}
if ($w3tc_query_string != “”) {
set $w3tc_rewrite 0;
}
set $w3tc_slash “”;
if ($w3tc_request_uri ~ \/$) {
set $w3tc_slash _slash;
}
if ($http_cookie ~* “(comment_author|wp-postpass|w3tc_logged_out|wordpress_logged_in|wptouch_switch_toggle)”) {
set $w3tc_rewrite 0;
}
set $w3tc_preview “”;
if ($http_cookie ~* “(w3tc_preview)”) {
set $w3tc_preview _preview;
}
set $w3tc_ssl “”;
if ($scheme = https) {
set $w3tc_ssl _ssl;
}
if ($http_x_forwarded_proto = ‘https’) {
set $w3tc_ssl _ssl;
}
set $w3tc_ext “”;
if (-f “$document_root/wp-content/cache/page_enhanced/$http_host/$w3tc_request_uri/_index$w3tc_slash$w3tc_ssl$w3tc_preview.html”) {
set $w3tc_ext .html;
}
if (-f “$document_root/wp-content/cache/page_enhanced/$http_host/$w3tc_request_uri/_index$w3tc_slash$w3tc_ssl$w3tc_preview.xml”) {
set $w3tc_ext .xml;
}
if ($w3tc_ext = “”) {
set $w3tc_rewrite 0;
}
if ($w3tc_rewrite = 1) {
rewrite .* “/wp-content/cache/page_enhanced/$http_host/$w3tc_request_uri/_index$w3tc_slash$w3tc_ssl$w3tc_preview$w3tc_ext” last;
} END W3TC Page Cache core

• This reply was modified 1 year, 4 months ago by magestyx.

Hi, Marko.
We have the HTTP2 push box checked, but it always says it can’t be used with Disk Enhanced.

We found several more sites yesterday where the minify cache was broken and so have had to disable it on them. We’re down to only 2 sites where it still works now, but since we have everything on these sites and servers configured the same we might go ahead and disable it on them as well to be on the safe side.

We’ve looked at every error log and config we can find and there’s no explanation so far why this is happening. Really a shame as it W3 works so well besides this one big issue.

(sorry – I thought I submitted this 3 days ago and it was still sitting in the browser today)

minify cache mode: auto
minify cache method: disk
html minifier, js minifier, css minifier: all set to default
(minify off completely for the moment due to the issue)

You’re right – there were some duplicate cache-control directives. I’ve tried to clear those out now.
(The cache checker here is showing the values correctly: https://www.giftofspeed.com/cache-checker/)
But the point is that it all does work when the minified files are created. If no minified files are created then they simply won’t load so the page has no formatting regardless of how the browser caching/expiring times are set.
I’ve looked in the /cache/objects and /cache/page_enhanced locations and folders and files are created in there fine as needed/expected. /cache/minify has only the default .htaccess and index.html , though.

When going to a file using the alternative method like https://adwerx.net/?x55674&w3tc_minify=f3528.css
Shouldn’t the content be minified? Since it’s not does that indicate that there’s something in the minifier not triggering at the last steps maybe?

thanks.

• This reply was modified 1 year, 4 months ago by magestyx.

Here’s a pretty simple site this is happening on: adwerx.net
We just tried turning off “Rewrite?URL?structure” (normally on) and the site looks fine again with the css loading in like :

<link rel="stylesheet"  media="all">

It’s not a file created in the /minify directory, and it’s not actually minified. The code inside looks like an intermediate file before the minification process should happen.

/* 123-css-output.css */

/* 1   */ /* xl - DESKTOP STYLES */
/* 2   */ .box-type-1 {
/* 3   */ 	border: 5px solid #000000;
/* 4   */ }
/* 5   */
/* 6   */ .box-type-2 {
/* 7   */ 	background: #afafaf;
/* 8   */ }
/* 9   */
/* 10  */ .box-type-1 h2 {
/* 11  */ 	font-size: 12px !important;
/* 12  */ 	color: #ff0000 !important;
/* 13  */ }
/* 14  */
/* 15  */ .profile-item {
/* 16  */ 	border: 2px solid #afafaf
/* 17  */ }
/* 18  */
/* 19  */ .profile-item img {
/* 20  */ 	border-radius:20px; -webkit-box-shadow: 10px 10px 15px 0 #6905FF;
/* 21  */ box-shadow: 10px 10px 15px 0 #6905FF;
/* 22  */ }
/* 23  */
/* 24  */

FYI – we tried using the Plugin Organizer plugin to change the order plugins are loaded, but it didn’t help. The combined css files are still loading in the html of the hidden search form popup.

The code loading the css files in the plugin is as below. In the html output the files are back to back, so I guess that’s why they’re combined together.
Excluding the content.css and grid.css for Strong Testimonials does do the trick – the files are recognized and in the right location – but we’re only talking one plugin on one site here. To go through every site and find every css file not combining correctly wouldn’t be practical.

wp_register_style( ‘wpmtst-grid-style’,
WPMTST_PUBLIC_URL . ‘css/grid.css’,
array(),
$plugin_version );

Hi, Marko.

We tried the other minifiers and the situation remains (only if Combine is set in the CSS minify settings).

After more testing we’ve found one other peculiarity.
Apparently it’s making a big difference exactly WHERE the Combine is adding back the new css files in the page code. If we use the Chrome inspector, it looks like the combined css files from Strong Testimonials (for instance) are missing. However, we can find the combined Strong Testimonials css file (2 small css files – content.css and grid.css) added somehow inside the html code for the search popup. So if we look in the raw page output code (Ctrl+U) we can find that css file. (All other css files on the site are combined into 3 other combo files) But in the inspector, it only shows if we click on the search icon in the displayed page, which display the search popup. Seriously this is one of the strangest issues we’ve ever seen.

So, the testimonials all load into the page without formatting as three 100%-wide-rows. Then clicking the search icon, the search popup/form shows, and through the transparent page overlay behind it you can see the three testimonials suddenly format perfectly as they should be (and that missing css combo file now can be found in the inspector). Closing the search box does the opposite – the css file disappears from the inspector and the testimonials lose their formatting, going back to 3 default 100%-wide stacked rows.

The question then is – what controls where the combined css files are re-added into the overall page structure? If we could specify that then they wouldn’t be added into problematic places.

That’s all the more info I have at the moment. What a strange situation.

Magestyx

Correct – on the live/current site with the page you displayed, only minify is on for CSS. The testimonials display correctly on the page as 40% wide flexbox elements because grid.css code from Strong Testimonials is included. As soon as we change the minify method to Combine, or to Combine & Minify, certain files like grid.css have all their content inexplicably missing from the final output CSS, so the testimonials display as default 100%-width columns like https://imgur.com/a3iUeCs

Again, that’s just a single specific example. There’s others like with AIOSEO – other plugins like that also suddenly have their CSS left out using any form of W3 CSS Combine.

Oh – I forgot to answer two of your questions:

Minify Cache Method: Disk
CSS minifier: Minify (default)