Sniffer glitches and changes color when there is a mob under it while suffocating in a tight/small area.

When there is a mob under a sniffer in a tight area, the sniffer will start suffocating since its in a very small/tight area, but it changes color because there is a mob under it in the same hole, this doesn't happen when spawning a sniffer with no mob under it, it doesn't seem to change color.

How to reproduce

Start by spawning any small mob inside a tight area where the sniffer will suffocate.
Then spawn a sniffer on top of the mob and it will start suffocating, but will change color.

Observations: Sniffer turns black while suffocating because there is a mob under it.
Expectations: The sniffer should keep on suffocating without changing color even if a mob is under it.

Relates to MC-270617

Discovered while making MC-270617.