HDR is washed out or broken across multiple platforms

Default HDR images look incorrect for different reasons on each platform:

PC SDR:
[Image Removed]

PC HDR:
[Image Removed]

Go the DefaultEngine.ini of EngineTest and set the following:

[SystemSettings]
r.AllowHDR=True

Then launch EngineTest from the editor for Windows or BuildCookRun -project="EngineTest" -build -cook -stage -pak -package -platform=[Platform]

Image looks correct in SDR

Set r.HDR.EnableHDROutput=1 in console

Either the image will be washed out or completely oversaturated