Potions of oil do not disappear after being 'U'sed
Potions of oil remain in the character's inventory after being poured on the ground or alarm traps.
Problem
Potions of oil do not disappear from the character's inventory after being used on the ground or alarm traps.
How to reproduce it
Find a potion of oil and 'U'se it while standing on the ground. The game will say you poured it there, but the potion remains in your inventory. Now find an alarm trap and repeat that action. The game will say you silence the squeaky board with the oil, but the potion is still among your items.
Notes
Drinking them works normally (with the expected results).