HDR only working with ProtonGE and Wayland (AMD/GNOME Desktop)

Running latest Bazzite, GNOME Desktop with an AMD 7800XT. I've run just about every launch command and ScopeBuddy trick I could Google, but the only thing that gets HDR working in any games is using Proton GE and the launch parameter:

PROTON_ENABLE_WAYLAND=1 PROTON_ENABLE_HDR=1 ENABLE_HDR_WSI=1 %command%

Removing PROTON_ENABLE_WAYLAND=1 also breaks HDR.

Is this meant to be the solution, or am I supposed to be able to get HDR working on desktop and AMD "out of the box"?

Thanks in advance!
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