Unable to lower max refresh rate (Ally X)

Maximum refresh rate can be changed easily in desktop environments, but not Steam Gaming Mode.

I would like to lower max refresh rate from 120hz to 60hz to lock framerate using vsync (don't question this - it's complicated and related to lsfg-vk) but it doesn't seem to be possible.

Things I've tried:
  • Steam performance menu
  • Handheld Daemon "Run Steam at 60/72hz" setting
  • Setting refresh rate in Desktop mode, then switching back to Steam Gaming Mode
  • Setting a global GAMESCOPE_REFRESH_RATE=60 environment variable from desktop mode
None of these had any effect.
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