I made a raid plateform on the ocean, using upper wooden slab, and put a single villager with a workstation in the center. When I come close to the workstation with bad omen, the raid start. But at each wave, illager spawn but do not moove / attack me. They seems "froze". They still have IA because it looks like they want to attack me but they neither shoot, attack or move toward me. Same with evoker, witch, ravager. I tried several raid, same issue each time. I talked with mojang dev Cory Scheviak about this and he told me to report it, and that may be a pathfinding issue because all the plateform is made of slab. I change the inner circle of the plateform using double slab (so a complete block) and indeed it fixed the issue.

Here is a twitch clip with better view of what is happening : https://clips.twitch.tv/JazzySpotlessAubergineBudStar-KjzZVvLQa1go1lCU