After some investigation, on our website random page, CSS usage is 9%, which isn’t surprising because it doesn’t load anything.
However, checking in the validated URL, it seems like the plugin does not find the correct paths, which is predictable by looking at the URLs.
Failed to fetch:
/wp-content/themes/twentyseventeen/core/inc/compatibility/gutenberg/assets/css/uncode-gutenberg-frontend.css?ver=3.4 (HTTP 404: Not Found)
/wp-content/themes/twentyseventeen/library/css/style.css?ver=1630411711
/wp-content/themes/twentyseventeen/library/css/uncode-icons.css?ver=1630411711
/wp-content/themes/twentyseventeen/library/css/style-custom.css?ver=1630411711
Looking in our server, twentyseventeen does not have a core or library file, or perhaps your plugin adds it in order to work with the default theme (non-AMP).
As previously said, this is linked to the WordPress 6.4(.1) update, because we’ve never encountered any issue with your plugin before.