Baby llamas suffocate when below a solid block while standing on top of a carpet

This issue was believed to be fixed in Minecraft 1.14 Pre-Release 1 as stated in MC-142768, so please could you provide some screenshots or recordings of this occurring whilst the F3 Debug Screen is enabled.

I investigated further.  It seems to be carpet that makes the difference.  They will walk onto such carpet or they can be pushed.

Confirmed. This is very odd since the eye height of baby llamas is inside of their hitbox. Also you don't need a lead to reproduce this, in my case the baby llama walked straight into the gap and suffocated.