Cannot hide geo from camera ray in Houdini if USD already has anrold:visibility primvar (from Maya)

[hollov]

To Reproduce
Steps to reproduce the behavior:

1. Create a cube in Maya, and disable e.g. "Casts Shadows" under Arnold-Visibility options in attribute editor
2. Export the cube from to USD with Arnold job context
3. In Houdini try to hide it from camera rays using "Render Geometry Settings" node: uncheck "Camera Ray Visibility" under Arnold tab - Visibility
4. In Arnold render you'll see the cube remained visible in camera

Expected behavior
I expect the visibility override to work so the cube should become invisible for camera rays.

What happens is during USD export in Maya the Mesh prim gets an arnold:visibility = 253 prim var.
Houdini creates an arnold:visibility:camera = False prim var.
And it seems these are not merged, but arnold:visibility takes precedence. I'd expect it would result an arnold:visibility = 252

Used Software Versions

• Maya 2024.2, mayausd-0.32.0_202505060957-eeb3aaa, mtoa-5.4.8
• Houdini 20.0.590, htoa-6.3.7.0_r71394d1_houdini-20.0.896.py39

[autodesk-oss-arnold-bot]

Issue synced internally to ARNOLD-16645