When shooting eggs fast with a dispenser, some chickens spawn seemingly "stuck" in their position and do not get pushed backwards by the eggs being shot at them, finally dying. Note that the chicken spawns in a 1-block space surronded by blocks on their right side, left side, one above and one below, forcing them to only be pushed backwards.
Linked issues
duplicates 1
Comments 2
Related to MC-65.
This is probably related with the MC-1725 issue I submited a while after, only that here they get kind of stuck in the floor and can be pushed back by throwing an egg manually (not dispenser) at them.