How do I fix permissions on Big Sur?
This appears to be the result of a poorly completed Time Machine restore
drwxr-xr-x@ 97 mark       staff   3104 26 May 09:54 /Users/mark/
    com.apple.metadata:_kTimeMachineNewestSnapshot    50
    com.apple.metadata:_kTimeMachineOldestSnapshot    50

You can try this 2 commands for suppress this attributs :
xattr -rd com.apple.metadata:_kTimeMachineNewestSnapshot /Users/mark 

and
xattr -rd com.apple.metadata:_kTimeMachineOldestSnapshot /Users/mark