Also if you spawn a horse in the corner next to a solid block, the horse will start taking damage.
It also works if you place water on fire in the nether
It also works if the bottom carpet is destroyed by liquid but if the liquid is removed from where the bottom carpet was, the carpets will fall
Also if A mod sees this, try making it so when someone reports a bug, it will show some bugs that are like the same as the one being reported and it may help duplicates from happening as much
The saplings need to be in a 2x2 pattern. Only one sapling doesn't cut it.