ProxyAccessor driven by referenced transform does not evaluate after re-opening scene

[ika-rporter]

Describe the bug
If I create a proxyAccessor to drive the xformOp properties on an Xform prim from a referenced Maya transform, it works as expected in the current session. However, once your save and re-open the scene, it no longer works.

Steps to reproduce
Steps to reproduce the behavior:

1. Create > Universal Scene Description > Stage With New Layer
2. Add an Xform prim
   2a. Add a Cube prim as a child of the Xform prim (for visibility)
3. Reference a file with a single transform
4. Create a proxyAccessor using mayaUsd.lib.proxyAccessor.connectItems
5. Move the referenced transform; observe the Xform prim follows
6. Save and re-open the scene
7. Observe the Xform prim is at origin, and no longer follows the referenced transform.

An example setup is provided in the attached scene.

Expected behavior
A proxyAccessor to drive the xformOp properties of an Xform prim, driven by a referenced Maya transform, should still work after the scene is re-opened.

Attachments
scene.zip

Specs (if applicable):

• Rocky 9.3
• Maya 2023.3
• MayaUSD v0.26.0
• Pixar USD 0.21.11

[wallworm]

Thanks for reporting. The team will investigate.