RTX Normal map flipping

[damaggio]

Hi support, this has been baffling me today, I got a normal map , not only this one apparently flips on RTX , see lighting on the bricks gets reversed... the geo is clean, no flipped normals, no flipped red uvs , freezed transforms , tried inverting green channel , then tried the red channel.
But as seen here I believe is the RTX since the GPU always renders correct, please need assistance for production show.
Thanks guys.

Windows 7 RTX2080 Vray next 4.30.02 April 15th

[damaggio]

I found the problem, I forgot that my Lighting>Use two sided lighting was checked so one wall had normals reversed and I didn't noticed.