Android App Icon white outline or 'fuzz' when using non-standard zoom

We've tried lots of different Median App Icon upload options (png, jpg, square, circle, with/without background colour set, various zooms), but we can't seem to get rid of a fuzz or small white lines around the right and bottom app icon edges on Android when the display size is smaller than default.

App Icon appears fine when viewing at middle/default or larger display sizes.

The user is on a Pixel 8 Pro running Android 15 and using the default Pixel launcher, and this seems to happen with any Median App. Other native apps on the phone don't appear to have the same issue.