Parrots don't imitate piglin brutes

Parrots are supposed to imitate piglin brutes, because they are hostile mobs. However, after testing, the parrots never made any piglin brute sounds.

What I expected to happen was...:
The parrots made high pitched piglin brute snorting, with the "Parrot snorts mightily" subtitle.

What actually happened was...:
The parrots did not imitate the piglin brute like they do to other hostile mobs.

Steps to Reproduce:
1. Have a piglin brute and some parrots
2.  No parrots made any piglin brute sounds.

Code analysis

Code analysis by haykam can be found in this comment