Vindicators are having problems with their AI because once a one vindicator sees you it'll run at you and hit you once but if you stay in your place without moving ,it'll have some problems with its weapon and you can see that it tries to hold its axe but it fails and then hides it,also if they were inside a small hole they won't hold their axe when they're aggressive,however they were used before to hold their axe when they become aggressive
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I have noticed this strange behaviour too. A good way to demonstrate it, ís by summoning a villager with no ai and then summon a vindicator, the vindicator will rush towards the villager with his axe out and hit the villager once, but since the villager dont flee, the vindicator is now standing right up against the villager which apparently confuses his AI since he rapidly will raise his axe and then hide it away again a number of times before finally being able to hit and kill the villager.
I am unfortunately not able to create videos of this behaviour but this screenshot shows the vindicator with his axe hidden, right next to the villager.