Plugin loaded from UNC path crashes when loading USD file containing MaterialX (MaterialXGenShaderMayaUSD.dll)

**Describe the bug**
With Maya-USD plugin located on UNC path (e.g. shared storage) on Windows 10) Maya crashes with C0000005: ACCESS_VIOLATION for ...\USD\bin\MaterialXGenShaderMayaUSD.dll when loading USD file with MaterialX material.

**Steps to reproduce**
1. Load Maya-USD plugin from UNC path. To reproduce locally use e.g. `//localhost/c$/tmp/usd/2025/0.29.0/...`
2. Maya usd.mod file paths.
```
+ MAYAVERSION:2025 USD 0.23.11 //localhost/c$/tmp/usd/2025/0.29.0/USD
+ MAYAVERSION:2025 MayaUSD_LIB 0.29.0 //localhost/c$/tmp/usd/2025/0.29.0/MayaUSD
+ MAYAVERSION:2025 MayaUSD 0.29.0 //localhost/c$/tmp/usd/2025/0.29.0/MayaUSD/plugin/adsk
+ MAYAVERSION:2025 MAYAHYDRA 0.6.2 //localhost/c$/tmp/usd/2025/0.29.0/MayaUSD
```
(content is same as the one from installation, only paths are modified).
4. In Maya, load maya-usd and lookdevx plugins:
```
loadPlugin mayaUsdPlugin;
loadPlugin LookdevXMaya;
```
5. Open USD Layer Editor, Create -> Stage From File...
6. Select a chess_set.usda (from https://github.com/usd-wg/assets/tree/main/full_assets/OpenChessSet) and confirm
7. Crash

**Expected behavior**
Load a file without crashing when plugin is on UNC path.

**Attachments**
[MayaCrashLog240816.1553.log](https://github.com/user-attachments/files/16689883/MayaCrashLog240816.1553.log)
[MayaCrashLog240816.1553.dmp](https://github.com/user-attachments/files/16689886/MayaCrashLog240816.1553.dmp)
[scene.ma.zip](https://github.com/user-attachments/files/16689915/scene.ma.zip)

**Specs (if applicable):**
Windows 10
Maya 2025.2
USD 0.29.0_202406120710-f8eb6c1 (pre-compiled from git releases)

**Additional context**
Used OCIO config is this one: https://github.com/colour-science/OpenColorIO-Configs/blob/master/aces_1.1/config.ocio
To clone chess asset:
```
git clone --no-checkout --depth=1 https://github.com/usd-wg/assets.git
cd assets\
git sparse-checkout init
git sparse-checkout set full_assets/OpenChessSet
git checkout main
```