Reproduction steps:
1. Make sure that HDR is enabled in Windows via the Display Settings
1. Make sure that IL2CPP is installed via the Unity Hub for the Editor version that you’re going to be using
2. Open the attached “repro_IN-87680“ project
3. Open the “Assets/OutdoorsScene.unity“ Scene
4. Open the Build Profiles (“File → Build Profiles“)
5. Build the project
6. Open the built executable
7. Observe the Player

Expected result: Canvas is only rendered once - in the middle of the Player
Actual result: Canvas is rendered in each split-screen

Reproducible with: 2022.1.0a16, 2022.3.53f1, 6000.0.28f1, 6000.1.0a5
Not reproducible with: 2021.3.46f1, 2022.1.0a15

Reproducible on: Windows 10 (22H2), Windows 11 (10.0.22631) (user’s)
Not reproducible on: No other environments tested

Notes:

* Reproducible in Player
* Not reproducible in Play Mode
* Disabling HDR fixes the issue
* Opening the Player while HDR is disabled, then enabling HDR, changing the screen resolution and opening the Player again causes a crash