vray 2sided mat bump issue (3.6)

[Fat Tony]

hello,

We are still running couple nodes on 3.6 and we got an issue with 2sided materials.

When we have bump, mainly normal plugged into both front and back side of the 2sided mat, we get buckets when rendering on DR.

We use vray normals and everything, with single workstation there is no issue. The moment we unplug the bump from backside it is all OK.

Is there some specific reason for this, or is it bug ?

Thanks a lot

[svetlozar.draganov]

It looks like a bug but I'm not 100% sure since I have no idea whether bump is expected to work properly on both sides of VRay2sidedMtl.
Would it be possible to attach sample scene for investigation, and send us a render output that exhibits the issue.