When a illager damaged by another illager, the illager attacks another. For example, a pillager or an evoker attacks a vindicator, the vindicator attacks them. I think it is a serious bug.

Steps of Reproduce

1.Summon a pillager or an evoker

2.Summon a vindicator in the stuck space

3.Make that a pilager or an evoker attacks vindicator

4.The vindicator will attacks them.

If producers fix the bug, minecraft is more quality than now.