As I started playing the latest snapshot, 21w03a, I realized that my chickens were slowly escaping through the glass barrier surrounding their pen. I utilize entity cramming for both my chicken farm and a cow crusher. I gathered some of my escaped chickens within some fences and noticed that when the baby chicks grew to adults, they got pushed out of the fence wall. I then tested this with the cow crusher, and the same occurred. After the cows grew to adults, they began escaping the one block of space they had been crammed in, and I had about 10 wandering around the yard. I believe this is due to the bug fix MC-9568 that is supposed to prevent mobs from suffocating within walls. I had never noticed that bug before, nor had problems with mobs escaping until today.
I reverted my seed back to 20w51a, and see that it is fine again.
Linked issues
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Obviously not exactly a duplicate as the reporter has no issues with it after reverting back to 20w51a.
My issue wasn't a duplicate of MC-9568, but rather a side-effect of the bug fix related to that issue in 21w03a. However, the problem of entities passing through blocks (like fences) is not an issue now in the current snapshot 21w05a. No more escaped cows and chickens!
This seems to be happening again in the current snapshot (21w15a). I have an automatic chicken farm where the chicks stand on a slab and suffocate in the block above them when they die. In 1.16.5, I had glass on the outside of the killing chamber and it worked fine. Now when the chickens grow up they are pushed into the glass block and escape. Even when I replace the glass with planks, there is a problem with their drops, some of which glitch through the blocks and end up outside the farm.
duplicates MC-9568