Reproduction steps:
1. Create a new 3D project (EDIT: notes at bottom seem to imply it should be HDRP project)
2. Drag the Game view tab to another window (flickers more if both scene and game view windows are visible)
3. Move the mouse around the editor or click inside the Game view window or resize the Game view window

Expected result: Game view renders the scene
Actual result: Game view flickers black

Reproducible with: 6000.1.0a2 6000.1.12f1, 6000.2.0b10, 6000.3.0a3
Not reproducible with: 2022.3.65f1, 6000.0.54f1, 6000.1.0a1

Reproducible on: Windows 11, DirectX 12
Not reproducible on: MacOS 15.5 (Intel)

Note:
Does not reproduce when in play mode
Does not reproduce with urp