I had this on half full disk, this one was last without hardware raid
Had unmontable btrfs encrypted, was fighting with that whole month, UNRAID errors like - no valid btrfs file system, no file system etc + similiar to this:
parent transid verify failed on 31302336512 wanted 62455 found 62456
I was mounting in read only, maintenance modes, rescue, recovery...
solution was simplest ever:
sudo mkdir -p /mnt/diskX # X corespond to +1 higher number already taken
mount -t btrfs -o recovery,nospace_cache,nospace_cache /dev/sde1 /mnt/diskX
when it mounted, and data was visible in SMB and in terminal, just copied it to other disk, it still remains as unmountable
I'm running UNRAID 1,5y, and still dont have parrity drives
here left 150GB to copy: