Hellraiser
Arcane
This is one of the reasons why I reloaded an earlier save file after having problems with Mr X specifically to purge the library of zombies and clear some corridors I knew I would have to use later.
My main gripe with the game on hardcore so far (almost finished Leon A) is the ammo rubber-banding and weapon damage randomness (also rubber-banded from what I noticed). What is the point of saving ammo if the game suddenly decides you need to unload everything into the first boss fight because you hoarded too much ammo just as I had it happen to me? They should at least fix the damage for boss encounters. RE3 hard and REmake could do ammo scarcity properly without resorting to cheap tricks like rubber-banding.