Issue: Other Actions fails

This is consistent with the behavior of Other Action... in XenForo's moderator tools when selecting multiple threads in forum view and choosing 'Other Action...' Nothing happens. From my understanding, this is intended as a label for the drop-down and not as a valid selection.

So I'm not sure that this is a bug, unless it is broken in XenForo too and supposed to do something I'm unaware of.

You are correct. This is not a bug. I was looking for the undelete function and as it was not in the drop down I thought it must be available after clicking 'other actions'.
My misunderstanding comes from VW using different interface steps than XF. (XF has undelete in the drop down without the need to go trough another screen)

VaultWiki also provides Un-Delete in the drop-down, but only if there is at least one item on the page that is already deleted. Likewise, it should not provide un-delete on the delete screen unless that page was already deleted.