How to reproduce:
1. Ensure that HDR is turned on in the Display Settings of your OS
2. Open the attached project “IN-138093”
3. Open the “TestScene”
4. Enter Play Mode
5. Observe the Game View
Actual result: Canvas UI is not updated when Overlay Camera is active
Expected result: Canvas UI is always updated and visible
Reproducible with: 6000.3.1f1 (37142da19a94), 6000.4.1f1, 6000.5.0b1, 6000.6.0a1
Not reproducible with: 6000.0.71f1, 6000.3.0f1 (d1870ce95baf)
Reproducible on: Windows 11
Not reproducible on: No other environments tested
Note: Issue also occurs with UI Toolkit