Minecraft Version: 1.19.2
C&B Version: 1.3.135
Other mod installed:

The pathfinding AI in vanilla minecraft seems to take non-solid chiseled block as if it's not exsit; Therefore cause mob trying to walk through such blocks, or take such blocks as invalid paths.

Footage video:
https://github.com/ChiselsAndBits/Chisels-and-Bits/assets/51637996/e9be11c1-9f2e-44b3-a21a-31bf95288813

The behaviour you showed in the video is correct.

C&B calculates a bounding box for pathfinding which only includes the solid pathable materials. And returns that when asked.

So i assume that is the cause why the villager won't walk over it, because he can not completely stand on it.

Will this issue get fixed then?

In what way is this an issue? You used bits which make the pathable bounding box to small for the entity. This is normal behaviour.