Piglins make retreat sound when using custom Spawn Eggs to spawn them in Overworld or The End, even though the custom Spawn Eggs have {IsImmuneToZombification:1}

Use this Spawn Egg:

/give @a minecraft:piglin_spawn_egg{EntityTag:{id:"minecraft:piglin",CustomName:"\"猪灵\"",IsImmuneToZombification:1}}

Summon a Piglin in Overworld, but it still plays retreat sound 1st.

Feature? Invalid or WAI.