Reproduction steps:
1. Open the attached “CharacterAnim.zip” project
2. Open the “Assets/Scenes/Menu.unity“ Scene
3. Enter the Play Mode
4. Click the “Start” button in the Game view
5. Click the “Back” button in the Game view
6. Click the “Start” button again in the Game view
7. Observe the crash

Reproducible with: 6.3.3, 6.4.0 (6000.0.71f1, 6000.3.11f1), 6.5.0-pre.2 (6000.0.71f1, 6000.3.11f1, 6000.4.0f1, 6000.5.0a8, 6000.6.0a1)

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

First few lines of the stack trace:
0x00007FFD106D952D (Unity) AsyncGPUReadbackBuffer::ValidateTexture
0x00007FFD106B1239 (Unity) AsyncGPUReadbackManager::Request
0x00007FFD1071539E (Unity) RenderingCommandBuffer::ExecuteCommandBufferWithState
0x00007FFD10716654 (Unity) RenderEventsContext::ExecuteCommandBuffers
0x00007FFD10371358 (Unity) Camera::CustomRender