usd procedural loses material assignments for layered crowd sim

[xsisupport]

Describe the bug
Layered usd set up for a crowd sim, like this:

#usda 1.0
(
    endTimeCode = 1
    framesPerSecond = 24
    metersPerUnit = 1
    startTimeCode = 1
subLayers= [
@./stickAnim.usd@,
@./stickMatAssign.usda@,
@./stickColl.usda@,
@./stickStatic.usda@,
@./stickMaterialLib.usda@
    ]
    timeCodesPerSecond = 24
    upAxis = "Y"
)

Renders fine in Solaris viewport, USD View, and the Maya viewport (with Maya USD). But the usd procedural does not render with the assigned materials. All the geometry gets the default Arnold shader.

To Reproduce
Scene is attached

Screenshots

Used Software Versions

• Arnold 7.2.1.1

[autodesk-oss-arnold-bot]

Issue synced internally to ARNOLD-13535

[cpichard]

Hi @xsisupport , would you have the test scene ?