Yeah, that’s why I didn’t suggest the workaround mentioned in the linked issue.
Unfortunately, this is a pretty common issue with applications that expose System tray status indicators, but those “workarounds/fixes” I suggested get the job done at least for some apps, and for users like me that aren’t designers but still care about consistency is what matters.
For example I have been using Papirus icons for some years now, partially because I really like them but mostly because if one of the most complete ones.
Hopefully with the redesign happening around icons things improve, but there is always need for more designers contributing as there are so many icons, and obviously they’re focusing on the existing ones, and even after that is completed, including third party icons may still depend on someone who cares enough about consistence and this particular app contributing with that icon.
If you/someone wants to help here’s what they need help with Plasma Icon Update - August 2024 - #3 by Anditosan and here how to start Get Involved/design - KDE Community Wiki