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@endymion00 thanks for the advice, most certainly not ideal but unfortunately necessary, a real shame because this plug-in most often gives great results.

There is still no fix for this and it is still happening to websites of our clients. Here another example of a multisite installation where the .htaccess file in the minify folder was faulty again:

# BEGIN W3TC Minify cache
# END W3TC Minify cache
# BEGIN W3TC Minify core
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /wp-content/cache/minify/
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^(.+\.(css|js))$ /index.php [L]
</IfModule>
# END W3TC Minify core
    RewriteEngine On
    RewriteBase /wp-content/cache/minify/
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^(.+\.(css|js))$ /index.php [L]
</IfModule>
# END W3TC Minify core

This is the file after regenerating it (deleting and clear caches):

# BEGIN W3TC Minify cache
# END W3TC Minify cache
# BEGIN W3TC Minify core
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /wp-content/cache/minify/
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^(.+\.(css|js))$ /index.php [L]
</IfModule>
# END W3TC Minify core

@vmarko is there any update on this issue?
Multiple user report a problem and we have multiple sites with this issue.
@endymion00 have given clear instructions on how the issues can be replicated.

Is there any update on this issue? We’re experiencing similar issues where the .htaccess file has multiple/duplicate/incomplete rewrite rules/conditions which breaks the minify caching completely. Deleting the file and flushing the cache resolve the issue but it keep appearing on “random” intervals.

Hello Ewout,

Thanks for your quick reply.
I tried to put the filter inside a muplugins_loaded action, but no succes:

add_action('muplugins_loaded', 'custom_muplugins_loaded', 10);

function custom_muplugins_loaded()
{
   add_filter('plugin_locale', function($locale, $textdomain) {
      if($textdomain == 'woocommerce-pdf-invoices-packing-slips') {
         $locale = 'de_DE';
      }
      
      return $locale;
   }, 10, 2);
}

You don’t by any change have a working example on how the change the locale of the packingslip PDF?