When an overhang with a trapdoor positioned vertically at the rear of the space has a baby cow in it, the mob can be pushed further into the space by another mob (like an adult cow). The baby then glitches through the trapdoor and hurts until death. Is this designed behaviour?

Additional: baby cow doesn't even need to be pushed under overhang. When walking under overhang, the same glitching through the trapdoor occurs, killing the mob.