I don't know if it's a client or launcher error, since I've seen youtubers that have the new sounds. And only the footsteps of the zombified piglins are heard
and I say they are lost because they don't appear with the commands either ...
MC-174090
Client Bug: New Sounds are missing: Piglin, Hoglins, Zombified Piglin And Nether Ambient Sounds
Resolved
Invalid
0
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The command requires you to specify the players the sound should be played for. For all players that would be for example
@a.For example,
/playsound minecraft:entity.pig.death neutral @aworks fine.