Sometimes icons are a different size than they ought to be.  In Debian and Kubuntu the tool lintian lists these

https://lintian.debian.org/tags/icon-size-and-directory-name-mismatch.html

For applications in KDE git (see projects.kde.org) resize and icons which are the wrong size.  This will either be by changing the canvas size or by stretching the image as appropriate.

For each application make a tar with the right directories and fixed icons so it is trivial for someone with Git access to apply (or make Git branches somewhere).