Cannot access my Documents

I updated my iMac to 10.14.5 and seem to have some problems.

The folder “Documents” can’t be opened because you don’t have permission to see its contents.

The permissions look OK (not sure what default should be)

~$ ls -lad Documents
drwx------+ 735 ian  staff  23520 22 May 09:53 Documents/

Finder says I have Read & Write access

EDIT1

I used Finder to give everyone Read only access, and now I can open it.

EDIT2

~$ ls -leO@d Documents
drwx---r-x+ 737 ian  staff  - 23584 25 May 11:39 Documents/
 0: group:everyone deny delete

EDIT3
I used Finder to revoke everyone access, and now I can access it normally.

~$ ls -leO@d Documents
drwx------+ 737 ian  staff  - 23584 25 May 11:39 Documents/
 0: group:everyone deny delete

I just needed to restart my iMac (after a power failure) and found Pictures was similarly affected.

Finder Get Info says I have Read & Write access, but it was blocked

I used Finder to give everyone Read only access, immediately restored No Access and now I can open it.