Dovetailing off of the new Mire key logic, is there any reason we can't change the logic for Harmless Hellway, PoD BK Chest, TR BK Chest, and GT Map Chest to say "If this contains a small key, there are no logical requirements to access it"?
In the case of PoD and TR, it would only affect keysanity (or rather, all wild small key modes), but for GT it could be interesting even in standard dungeon items modes allowing a small key in map chest and a vanilla small key in pre-Moldorm in the same seed.