Multiple ArgumentExceptions are thrown when adding a VisualTreeAsset with Sprite Glyphs to a UIDocument

Reproduction steps:
1. Open the attached “IN-97781.zip” project
2. Open the “BUGREPORT” Scene (Assets > Assets > Scenes)
3. Enter Play mode
4. Observe the Console

Expected result: No errors
Actual result: Multiple “ArgumentException: An item with the same key has already been added.” and “InvalidOperationException: Operations that change non-concurrent collections must have exclusive access.“ errors

Reproducible with: 2023.2.0a18, 6000.0.44f1, 6000.1.0b12, 6000.2.0a7
Not reproducible with: 2022.3.60f1, 2023.2.0a17

Reproducible on: Windows 11
Not reproducible on: No other environment tested