I had a test to see what the zoglins behaviour was against every mob and it could not do any damage to a wither at all. I don't know if this is a bug or if that's meant to happen. Also the wither doesn't go for the zogling, it just acts like there's nothing there. thank you
Linked issues
duplicates 1
Comments 3
Duplicate of MC-177878.
Zoglins are intended to be undead mobs. The wither is immune to attacks from undead mobs, and undead mobs will never target the wither. Working as intended.