Incorrect opacity on point instancer mesh with the procedural

**Describe the bug**
The following scene has a mesh used as a prototype for a point instancer. This mesh is connected to a material which is semi transparent. The material doesn't seem to be applied on the point instancer mesh.

**To Reproduce**
Steps to reproduce the behavior:
1. kick opacity_issue.usda -r 320 240

**Expected behavior**
The torus on the right and on the left should look the same.

**Screenshots**
This is incorrect (procedural)

This is what we expect (render delegate)

[opacity_issue.usda.zip](https://github.com/Autodesk/arnold-usd/files/11113711/opacity_issue.usda.zip)

**Used Software Versions**
- Arnold: 7.2.1
- USD: [22.11]