Minor weird behaviour, like the title says.
When not running, the TransmissionQT icon is broken (far right):
When running, the icon displays correctly:
Upon close, the TransmissionQT icon goes back to its broken state. This is the only program which I have noticed does this.
I've tried unpinning and re-pinning it. No change. It's a program I use reasonably often, so I would like to have it there.
You could check with the projects github to see if it's a known problem.
Been looking. Can't see anything so far.
Just to clarify as I probably wasn't clear.
Check with the bug tracking for the latte-dock and transmission projects.
Maybe try changing icon sets?
Good idea with the icon sets, thank you. Didn't even think of that. Tried a few, but no difference in behaviour, unfortunately.
Maybe an app issue,
search in git in 686 issues.