Activity previews should have the ratio of the desktop, e.g. if desktop is 16:10 the preview should be also 16:10 to not distort the shown wallpaper in the preview. By now the ratio of the wallpaper is not kept in the preview which looks misscaled and odd... Reproducible: Always
It worked originally, but the ratio was removed from the qml api, and a fixed value had to be put in place. I'll have to think of something else, because it is problematic to have it like this (if nothing else, keep the aspect ratio and crop).
Confirmed still an issue on 5.20.2.