On the latest 1.18.2 version of this mod (3.0.2 beta) something about Dungeons Mobs breaks vanilla minecraft vindicator behavior. The mobs will continually run at the player but they will deal no damage or knockback whatsoever. I've tried a number of things to try to fix this but have had no luck.

I'm currently having the same issues.
This also is a problem with not only Vindicators, but Mountaineers as well.
Currently using just Dungeons Mobs and its required dependencies in 1.18.2 (Dungeons Libraries, Curios API, and Geckolib).

Just discovered the issue now,Was making a modpack for my friends to try out and the only issue I had was the Vindicator just hugging mobs and downgrading to the previous mod updates and the problem still persist