Some Geomtry just dont react properly to light

It is really rare, but we have some props that even if we tweak geomtry, or clean up the mesh, they appear wihtout contact shadows surfaces or detail shadows, and even dont have shadows. They just simply appear like flying. Why is this bug and is there a way to fix it?

Example of chairs, this props always appear in every siongle scene like flying.

Are there shadows if you put a plane light near them? Send a simplified version of the scene (walls and chair) so we can have a look.

Sended. R2RL-6EGE

With a plane light its the same.
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This is the result I’m getting. I just opened the scene and hit render. Which V-Ray and Maya version are you using?

Maya version is 2022
Vray version is V-Ray 6 for Maya, update 2.2

(v6.20.02 from May 28 2024)

Something seems messed up with how these chairs were instanced. I deleted all but one and re-instanced them, and now the shadows appear - so I suggest you do the same. Either way, in V-Ray 7, the shadows are rendered correctly without doing this, so we must have fixed something.