Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/Scenes/SampleScene.unity” Scene
3. In Mock HMD Add Camera window, select the Rendering Mode as “Single Pass Instance” for the Mock Camera 0
4. Enter the Play Mode
5. Select the Active checkbox for Mock Camera 0
6. In the Render Texture Viewer window, scroll down to view the output of the newly enabled Mock HMD and observe the shadow on the bottom of the green cylinder

Expected result: Shadow is fully rendered
Actual result: Only half of the shadow is rendered

Reproducible with: 2021.3.33f1, 2022.3.14f1, 2023.2.2f1, 2023.3.0a16

Reproducible on: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested

Notes:
- In 2023.2 and above the Mock HMD Add Camera window is called MockHMD.Editor.MultiCamera.Add and the Render Texture Viewer window is called MockHMD.Editor.MultiCamera.Ren
- In 2023.2 and above Scene appears darker
- Does not reproduce with Multi-Pass
- Does not reproduce with OpenXR or Vulkan
- Only reproduces in Play Mode
- Reproduces with All Graphics APIs