I encountered this too. There is a way to disable this in the notification settings, but that way is disabling notifications for "special application behavior" or something like that outright. You can probably do this per app, I'm just not sure what kind of other notifications this disables (if any). But if you wanna try, just it the settings icon on the next popup.
KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
If you encounter a bug, proceed to https://bugs.kde.org, check whether it has been reported.
If it hasn't, report it yourself.
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Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.