How to reproduce:
1. Open the attached “IN-104757” project
2. Open the “OutdoorsScene” Scene
3. Select the “Main Camera” in the Hierarchy, and ensure Post Anti-Aliasing is set to “Temporal Anti-aliasing (TAA)”
4. Enter Play Mode
5. Observe the result in the Game View

Expected Result: The lighting is stable
Actual Result: The light flickers

Reproducible with: 2021.3.51f1, 2022.3.63f1, 6000.0.51f1, 6000.1.8f1, 6000.2.0b6
Couldn’t test with: 2022.1.0a1 (could not fix HDRP rendering issues)

Reproduced on: Windows 11, Windows 10 (user reported)
Not reproduced on: No other environment tested

Notes:
- Flickering can be quite faint but can be more noticeable in the Camera Preview window in the Scene View
- Also reproducible in Player