So, I think the trashbags could have a greater purpose in Hello Neighbor 2. Instead of being used for just the same effect as a paint can, trashbags could also be used for houses which have fire in them. So the Museum and the Bakery have fire. If you put a trashbag in them like how you do with the ice, it forces the AI to take the Fire Extinguisher to put it out. The smoke effect could also be re-added to compensate this and a Fire Extinguisher should be added to the Museum outside of the boss battle.
So basically, it's like what the Beta did with Gasoline. Which should also be added back! If there's anything else that could be used for fire, just out it under this thread!!