Zombified piglins will not make anger noises when targeting a non-player entity.
My guess is that this is related to the new changes to neutral mob anger. Through testing, it seems that most neutral mobs (endermen are a notable exception) making angry noises are determined by the AngerTime
nbt tag being greater than 0. These mobs, however, don't use nbt to determine which mob they are targeting, meaning these sounds/appearances are no longer triggered. Wolves had the same issue before it was fixed.
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Edited the ticked to no longer include wolf stuff. We'll have to see if the wolf fix also ended up fixing the piglins
@DrownedZombie i'm not sure what you mean, zombified piglins aren't hostile toward wither skeletons. however, this bug has been fixed along with MC-187796
Possibly a duplicate and fixed with MC-187796?