Reproduction steps:
1. Open the attached “IN-101012.zip” project
2. Open the “SampleScene”
3. Open the Game view tab
4. Change the Game view resolution to 1280x720
5. Enter Play mode
6. Hover over the red Canvas button elements
7. Observe the color of the buttons

Expected result: The buttons instantly turn green once hovered over
Actual result: The mouse input is not correctly registered; therefore, the hovering is not reflected correctly

Reproducible with: 2022.3.63f1, 6000.0.51f1, 6000.1.9f1, 6000.2.0b7, 6000.3.0a1

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

Notes:
- Render Scale slider and a RenderUIBeforeUpscale toggle can be found on the “Custom RP Settings.asset”, which demonstrate the bug
- This issue was fixed/avoided in the URP (UUM-36231), however, the issue is still present in Custom RP
- Relevant code is in CameraRenderer.cs
- More important context can be seen in the Comments