I have a stable version on my website.I had such a problem. This is fixed by removing the old version of the plugin and installing the current one. In this case, all plugin settings have been removed. But it was not critical for me.
Plugin version v 3.11.5
wp-rocket.zip
drive.google.com
There are no false positives when checking in VirusTotal.
The function - Removing unused CSS does not work.
In the next version, this feature will be enabled.
If the function will work correctly after the update.
If Babak and Bobsmith deem it necessary, let them make corrections to the version.