Keep trying to get the 2022.02.05 version loaded. Once you can get that one, let me now and we'll try again. I'll upload a new package. In the meantime I think I have this problem solved. It is probably related to a change I made to the udev rules a few months ago.. I was trying to solve an issue where UD wss not picking up a disk that had no partitions. The issue is that with the rules I set, udev was churning everytime there was a 'change' on a disk. Basically all the disks were changing on system startup. I guess this annoyed btrfs and it decided it needed to do all that scanning,
I need to do some more testing, but I'm not at my test server and I need to test a bunch of hot plugs to be sure it all works out.