As you can see, they struggle to pathfinder up to hit me where I am, of the ones I spawned only one was able to, and even after hitting me once he got stuck.

The lower ones cant reach you because their hitbox is stuck inside the wall. I think it might be the same issue with the upper one, which got stuck inside a block when spawned.

I made a minor tweak so i shouldn't happen anymore. It seems to be some weird hitbox stuff going on and the ghoul thinking it can hit you.

Thanks! I'm not sure if they think I'm in range or not, as it only seems to happen with ferns specifically and not tall grass or just no grass blocks.

Tested it, the recent update does fix the fern problem, thanks!