Normal maps not working correctly in grouped objects

HI guys,

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.

Any idea why this happens?


Different UV mapping for the group?

I’m using triplanar, no mapping nor projections like cubic etc.

Is it the same if you change the order of the normal map and triplanar?
i.e.

bitmap > triplanar > normal > material
vs
bitmap > normal > triplanar > material

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.