I'm not sure that the bug is with the icons or apps really, but with the outline rendering code in unity. Thus I think you can leave it at this.
On the other hand if you find app icons that them selves look too small or otherwise odd-sized, you can maybe file a bug against the particular package that icon comes from. I've seen that some of the apps from the Apps Available for Download section has really tiny icons; that's not something we can fix in Unity, but could be fixed in the app package.
I'm not sure that the bug is with the icons or apps really, but with the outline rendering code in unity. Thus I think you can leave it at this.
On the other hand if you find app icons that them selves look too small or otherwise odd-sized, you can maybe file a bug against the particular package that icon comes from. I've seen that some of the apps from the Apps Available for Download section has really tiny icons; that's not something we can fix in Unity, but could be fixed in the app package.