bug? "PAM auth succeeded when it should have failed"

I've done a number of clean installs of FreeBSD 14.2 (I'm testing 
hardware) with only sshd enabled. When I do a password login on ssh I 
get the following message:


sshd[pid]: fatal: Internal error: PAM auth succeeded when it should have 
failed


It's easy to ignore as the login does work (as the message suggests). I 
certainly haven't been monkeying around with PAM. I'm literally 
installing from a memory stick, logging in on ssh and using dd to test 
drives can read/write.

I assume this is a bug of some kind in the clean install PAM 
configuration but I can't see what it is. Any ideas?

Thanks, Frank.