How to reproduce:
1. Open the attached "IN-124318_Test Scroll Rect.zip" project
2. Open the "SampleScene"
3. Observe the Game view
Expected result: The Canvas UI is drawn properly on top of the compositor output in Game View when the "Main Camera" is rendering to the "SampleRenderTexture"
Actual result: The Canvas UI is not displayed if the "Main Camera" is rendering to the "SampleRenderTexture"
Reproducible with: 6000.0.62f1, 6000.2.0a8 (6bc6fbc26ac6), 6000.2.13f1, 6000.3.0f1, 6000.4.0a5, 6000.5.0a1
Not reproducible with: 6000.2.0a7
Reproducible on: Windows 11
Not Reproducible on: No other environments tested
Note: Selecting the "Main Camera" GameObject in the Hierarchy and setting its "Target Texture" to "None" under the "Camera" component in the Inspector makes the UI visible in Game View