prototypes is not located in the children_Path of PointInstancer, binding a material to PointInstancer cannot override primvars:displayColor;

[fzss2012]

The first situation:

/world/prototypes/public_prim_A

/world/some/pointinstancer

/world/mat/metal_red

color3f[] /world/some/pointinstancer.primvars:displayColor=[(1,0,0),(0,0,1)]

rel /world/some/pointinstancer.prototypes =</world/prototypes/public_prim_A>

/world/some/pointinstancer.material:binding = /world/mat/metal_red

----result1----- material Invalid, unable to overwrite displayColor

The second situation:

/world/some/pointinstancer/public_prim_A

/world/some/pointinstancer

/world/mat/metal_red

color3f[] /world/some/pointinstancer.primvars:displayColor=[(1,0,0),(0,0,1)]

rel /world/some/pointinstancer.prototypes =</world/prototypes/public_prim_A>

/world/some/pointinstancer.material:binding = /world/mat/metal_red

----result2----- material active; displayColor and image texture screen mix；

What is the reason for this, the reason for passing the primvars attribute?

[jesschimein]

Filed as internal issue #USD-10411