Plex full scan daily and for hours

Cool. For reference here is a thread I had for a similar issue Ubuntu 22.04 - Slow scanning of libraries.

Maybe the kernel bug related to nfs deadlocks & caching has cheeped its way into the kernel on your system. Regardless, hopefully someone somewhere is fixing the actual issue so look for an updated kernel and test when it comes out. At least for now you have a solid one which works.