UsdImaging is not correctly updated when changing metadata in descendant prims of UsdSkelRoot.

[JamesPedFoundry]

Description of Issue

It appears that changes to metadata on Prims beneath a UsdSkel Root.
UsdImaging is not correctly updated when changing metadata in descendant prims of UsdSkelRoot.
This issue results in blackout in UsdViewer and errors, that are not recovered until layers are reloaded. Here's a sample of the errors.
Error 1):

Traceback (most recent call last):
  File "C:\USD2411_py310\lib\python\pxr\Usdviewq\appController.py", line 4998, in onPrimSelected
    while prim.IsInstanceProxy():
RuntimeError: Accessed invalid null prim

Error 1.5): Continue from 1, and toggle enabling Materials.

ERROR: Usdview encountered an error while rendering.Used expired 'Mesh' prim </HumanFemale_Group/HumanFemaleHair/Geom/Hair/Layers/HeadHair/BetaLeft_HairLayer/Standin/Shell_sbdv>  - UsdExpiredPrimAccessError thrown:
 -> Usd_ThrowExpiredPrimAccessError at C:\workspace\jped\github\USD\pxr\usd\usd\primData.cpp:266

Error 2) Selection fails to work. This is far easier to reproduce.

Steps to Reproduce

Error 1)

1. Load UsdView with the HumanFemale.usd example provided by Pixar:
   https://openusd.org/release/dl_usdskel_examples.html
2. Execute the following Python code in Python interpreter of UsdView:

look = usdviewApi.stage.GetPrimAtPath("/HumanFemale_Group/HumanFemale/Looks")
look.SetKind("group")
hairGeo = usdviewApi.stage.GetPrimAtPath("/HumanFemale_Group/HumanFemaleHair/Geom")
hairGeo.SetActive(False)

For Error 1):
3. Try selecting the hair (which you'll notice is still visible in the scene despite the geo being deactivated)

For Error 1.5):
3. Toggle Enable Scene Materials from display menu in the viewer.

Error 2):

1. Load UsdView with the HumanFemale.usd example provided by Pixar:
   https://openusd.org/release/dl_usdskel_examples.html
2. Expand the scene up such that all the Geom and Looks prims are visible (no need to go deeper).
3. Ensure selection in the viewport is working, and that selecting the Geom prims highlights these respective portions in yellow, and that selecting the hair or skin highlights in yellow (or selection color).
4. Right click and disable /HumanFemale_Group/HumanFemaleHair/Geom
5. Notice selection in the viewer no longer works.
6. Reload the stage.
7. Selection works again as per 3.

System Information (OS, Hardware)

Win11(NVIDIA A2000) and Rocky9(NVIDIA P4000)

Package Versions

v24.05 and v24.11-rc1 (likely earlier versions too)

Build Flags

--alembic --no-hdf5 --usd-imaging --usdview --no-tutorials --no-examples --build-shared --python

[jesschimein]

Filed as internal issue #USD-10341