https://www.bilibili.com/video/BV1Mr4y187Au

As this player did, he summoned a specific Silverfish with attackDamage=0 to attract Warden to attack it in order to other ones are able to fight back Warden. After Warden killing serveral Silverfishes, Warden suddenly stops attacking while the remaining Silverfishes still attacking Warden to death.

I think this is an AI problem. It perhaps has sth to do with the amount of mobs near the Warden. Try to reproduce and fix it.