When Apple introduced Big Sur like a year ago they had dropped 32-bit and tightened security to help protect our information. This created a few issues that developers had to address except for all those defunct indie developers that didn’t care enough about their users to update their plugins to 64-bit, but thats on the developer.
The security thing was only a problem in the first few months, Big Sur has been working fine for audio for most of the year and introduced performance improvements too.
I’ve been in Big Sur for a while and have many plugins from many devs and they’ve all been working fine, including V13. To be honest, I’m not sure why you’d be experiencing issues, unless your DAW isn’t compatible with 13??
There is a Repair option in Central’s Settings that MAY work, or the Organise feature. As it can become problematic if you have more than one “version” of the same plugin installed.
Oh Big Sur also has a 11.6.2 update now. Idont think it will fix you issues, but still worth trying.