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Canvas is drawn twice to the same render target when rendering into camera with render texture output



How to reproduce:
1. Download the attached project
2. Open the "SampleScene" scene
3. Enter "Play" mode

Expected outcome: Canvas is not drawn twice
Actual outcome: Canvas is drawn twice

Reproducible with: 2020.3.44f1, 2021.3.17f1, 2022.1.24f1, 2022.2.3f1, 2023.1.0a26

  1. Resolution Note:

    Unable to reproduce this bug on 2022.3 or 2021.3. I used the Frame Debugger within Unity and did not see the canvas drawing twice to the render texture. I also used NVidia Nsight to confirm and again was unable to see a second draw call on the same render texture.

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