Steps to reproduce:

1.  Open the project
2.  Switch to the "Windows-WithoutSplash" build profile
3.  Build and run on an HDR monitor. (Take note of the brightness and colours).
4. Switch to the "Windows-WithSplash" build profile
5. Build and run on an HDR monitor. (Take note of the brightness and colours after the splash screen).

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Actual results: 
The text says "HDR output is off".

Expected results: 
The text says "HDR output is on".

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Reproducible with versions: 6000.2.0a6, 2022.3.23f1

Not reproducible with versions: 2022.3.22f1

Can’t test with versions: 

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Tested on (OS): Windows DX12, and Mac.

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Notes:

• The splash screen is in SDR, that's ok. But then it should switch back to HDR output after the splash screen. Whether the splash screen is there or not, it should behave the same.
•  This also can happen in the editor, by previewing the splash screen. Start playmode on a HDR monitor, it should say "HDR output is on", then preview the splash screen. At the end of the splash screen, you will see "HDR output is off", when you would expect "HDR output is on".
• A workaround is to call `HDROutputSettings.main.RequestHDRModeChange(true);` on the start of the application.