Baby Chickens Escape Fences If Fence is On Hopper

If a hopper is placed under afence post, baby chickens can fit under the fence via the hopper's hitbox and escape the fence.

To recreate this issue, build a square 3x3 fence upon a 3x3 square of hoppers. Spawn baby chickens on the hoppers.

Optionally you can hold seed to tempt them out of the pen.

I do not know if this is intended.