How do I prevent HDR from washing out and being entirely incorrect in supported applications?

[Oliver Blay]

In multiple HDR-compatible modern PC titles, HDR is not rendering correctly at all. They appear extremely washed out and outright incorrect even compared to SDR, however only when the game window is Focused. Pressing the Win key to unfocus the game window immediately displays the game correctly, however this isn't usable as the window isn't in focus. Auto-HDR is disabled, RTX HDR is disabled, HDR is enabled before the game is opened, I have tried toggling whilst the game is already open, Display settings are using my full colour bit depth and range, I have a calibrated Windows colour profile,

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