Reproduction steps:
1. Open the attached “repro_IN-87031“ project
2. Open the “Assets/Test.unity“ Scene
3. Open the “Rendering Debugger“ (“Window → Analysis → Rendering Debugger“)
4. In the “Rendering“ section, under “Rendering Debug“, find the “Overdraw Mode“ parameter
5. Change the “Overdraw Mode“ parameter to “Opaque“ or “Transparent“
6. Observe the Scene/Game view

Expected result: There’s very little overdraw as there is only a single cube in the Scene
Actual result: There’s a lot of overdraw while there is only a single cube in the Scene

Reproducible with: 2022.3.51f1, 6000.0.25f1, 6000.1.0a2
Couldn’t test with: 2021.3.45f1 - No “Overdraw Mode“ parameter in the “Rendering Debugger”

Reproducible on: Windows 10 (22H2)
Not reproducible on: No other environments tested