Weird lighting on edge of sticked objects

Hello !

I have a wall made up of several planes (to optimize occlusion culling) but I have weird result with the bake lighting as the picture. We can clearly see the edges of each plane that makes up my wall. This even happens with cube by the way.

Here my lighting settings, in URP (Mixed light with substractive lighting mode, but occur in every mode)

If you have a lead to help me find out !