Hostile mobs associated with raids (path finding problem?)

Summary:
The hostile mobs associated with the raid aren't going to the village center? they are just stopping outside of it (which I guess is a bug). And never going towards the village center. I assume this is a AI / path finding problem.

What I expected to happen:

• I'd expect all the hostile mobs associated with the raid to run towards the villagers, which is placed in the center of the village (shown on the pictures).

What actually happened:

• All the hostile mobs associated with the raid are stopping outside the village - and never path finding their way to the village center (where the villagers are located).

How to re-produce this bug?

• Build a setup like shown on the pictures. And then trigger a raid with the bad omen effect.