FWIW, my experience is that of my 6 machines running Arch KDE, all using the LTS kernel, only one had this issue. The other five were unaffected. I have no explanation for the one with the issue, as it is configured similarly to the others and comprises similar hardware of similar age. 
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So the config lands in cache. Same thing would be achieved by logging out and back in again, I guess.
Yes, but JUST THERE is where the whole problem happens.
Did you consider filing a bug at KDE dev-site? (Again??!) …
I have at least already created an account there.
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I find on Kde when ever i have updates or i make changes i always either reboot or log out and back in depending on what it is. I find this necessary if changing things like icons and or themes. Also depending if updates are for Kde or other Arch based packages.
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I also do this frequently with updates when it doesn’t seem necessary. This is because I want to see whether the desktop settings still exist.
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