today I noticed that if I apply a material with a normal map it doesn’t work properly if I apply the material to the group, but it works if I apply the material to every single object.
The material applied in the attachments it’s the same one, but as you can se the behaviour is different.
Even changing the order does not fix the issue. But, apparently, the problem is related to the scene I’m working on, if I copy everything in a new one it works fine.