Hi there and thank you for the well made issue.
I did some testing and this seems to be a game bug. I can reproduce the issue when testing the game on Windows with both the native AMD and Intel drivers.
Choosing TAA as a Anti Aliasing option seems to minimize it for the most part here, though still some at the screen edges when moving the camera.
Closing because we're apparently matching intended behaviour here, even if it looks weird.
Nothing extracted yet.
In Ixion, when using AMD GPUs, shimmering (dis- and reappearing with camera movement) yellow pixels appear.
In the dark areas even tiny (a few pixels) colourful patches.
Software information
Ixion, regardless of settings used. This does not happen on Intel hardware.
System information
mesa 25.0~git2502060600.1d051e~oibaf~oApitrace file(s)
That apitrace was made using dxvk, the game crashes with wined3d in combination with apitrace.
Log files
steam-1113120.log.gz