Werewolf sees Ambushers who target them on odd nights.

[Kikigiri]

A werewolf on a non-full-moon night is apparently considered to have stayed home by the game. This means that when an Ambusher visits them, the following happens:

1. The Ambusher attacks the Werewolf, but hits their immunity (unless there's another visitor for the Ambusher to hit.)

2. More importantly, the WW gets the "you saw the ambusher" message that usually only appears when you visit the Ambusher's target.

These seem like bugs.