Sorry for misunderstanding! It is a command_block renaming them. But, the normal spawn egg and using nametag rename them is fine. So, this problem will only occur with piglin that have custom name that renamed by command block.
Command:
execute as @e[type=minecraft:piglin,name="Piglin"] run data merge entity @s {CustomNameVisible:1,CustomName:"{\"text\":\"Piglin\",\"color\":\"gray\"}"}
Nope. Just normal spawn egg
No datapack. Just Vanilla
Still not fixed in 20w16a
Happen in 19w11b, 19w12a, 19w12b, 19w13a, 19w14a
Its appear to duplicate x2 every time the command block execute the merge data command when piglin is looking at item they are holding and playing the sound of piglin again and again until piglin finished look item in their hand.
New Video (Data):
https://youtu.be/5xSfkUhrNEM