Since upgrading from Plasma 5.18 to Plasma 5.20 (openSUSE Tumbleweed) I get constant notifications about a crash occurring in the system tray. The system process crashing is kactivitymanagerd, occurring whenever I open certain KDE applications or navigating (changing directories) in Dolphin. Is the cause known and a bug report opened, or should I add this to the bug tracker?

https://bugs.kde.org/show_bug.cgi?id=427650

Seems like the same issue and it appears to have been fixed. Guess I need to wait for the openSUSE team to include that patch to confirm this.

Found a solution as suggested on the openSUSE forum thread: Navigating to ~/.local/share/kactivitymanagerd/resources and deleting database + database-shm + database-wal makes the crashes go away. Only annoyance was that all favorites were removed from the kickoff launcher and I had to add them back in, other than that all is working well once more.