If a warden attacks a zombified piglin, the victim nor the other zombified piglins around it will counterattack the warden.
Expected behavior: The zombified piglins will attack the warden if attacked, similar to a player.
What actually happens: they continue to walk around as if nothing happened.
I haven't tested if this is the case for wolves.
If any entity kills a zombified piglin in one hit, the other zombified piglins do not become aggressive, which is intended (MC-2432).