Question Baking lights not uniform on my meshes

Hi, i'm trying doing a light bake on my floor. The floor has a hole where I did put another asset, wich will form a tunnel to the lower floor.
the assets are all perfectly aligned with the grid, and all snaps to the grid.
In a recent bake, it was all perfect, the light was baked all in a smooth way along all the assets.

Then I modified only some vertex of the mesh (of course, i re-do the 2 UV sets of the mesh, and the bake started having issues.
Other than that, there is a square shaped shadow around the hole

Thank you!

 

up? no one?