How to reproduce:
1. Open the “ReportBug“ project
2. Open the “969-UIToolkit-Blending“ scene
3. Open the “Window > UI Toolkit > UI Builder“ window
4. Open the “UIDocument969.uss“ in the UI Builder window
5. In the UI Builder Inspector open the “ColorEmojiOpaqueDynamic“ label
6. In the Attribute section change Usage Hints to Dynamic Color
7. Observe the Viewport

Expected result: The red rhombus emoji is visible in the Viewport
Actual result: The red rhombus emoji is not visible in the Viewport

Reproducible with: 2023.2.0a18, 6000.0.1f1
Could not test with: 2021.3.38f1 (could not resolve the Console errors)
Not reproducible with: 2022.3.28f1, 2023.2.0a17

Reproducible on: macOS 13.5.2 (Intel), Windows 10 (User’s)
Not reproducible on: No other environments tested

Notes:
- Reproducible in the Player
- The missing red rhombus can also be observed in the Game view