If you turn on the HMD display mirroring, does the distortion show up there too?

(And if so, could you get a screenshot or video of it?)

Its a little hard to tell on a flat screen but I dont think it showed up in the steamvr mirror. It does show when recording directly on the hmd. Sorry for the external link, github wont let me upload anything here.
https://drive.google.com/file/d/1MHTuXTcffhceF3d5FwWiclwxplSsIFoV/view?usp=sharing

Adding some info on my part. Using 112% resolution per eye (2132 x 2368) or less on my Valve Index, the image is not distorted. Anything above 112% and the right eye does not work correctly. Happens only with SteamVR. Monado is unaffected. So far I haven't seen this behavior with any other VR game, Unity or otherwise.

Yeah... I definitely see it if using high resolutions, but only on Linux -- it works fine on Windows. I am actually glad to know it shows up on the Index as well, because that cuts down some testing; if it happens on a physically-connected headset, it's at least not in VRLink!

Question, actually -- when running under Monado, what's the setup? (Monado as a SteamVR driver, or Monado as an OpenXR provider?)

I am using Monado as an OpenXR provider, no SteamVR involved. Not sure, if Walkabout Mini Golf is an OpenVR title or an OpenXR title. Using xrizer as an OpenVR to OpenXR compatibility layer. Running all this with Envision as the build system.

It's OpenVR, for the record, but I've seen some folks say it has OpenXR support in addition (though I'm unsure if that's accurate). Thus the question. :)

And to double-check, when you're using Monado, the XRT_COMPOSITOR_SCALE_PERCENTAGE is set to something above 112?

And to double-check, when you're using Monado, the XRT_COMPOSITOR_SCALE_PERCENTAGE is set to something above 112?

Yes. I think the default is 140%, but I specifically set it to 200% to test it.