Kontact: Cannot save certain settings (toolbar, appearance, modules)

I recently reinstalled my Kinoite system and I also installed the Kontact suite. However, I cannot change a lot of settings, apparently because of a weird interaction between Kontact and KNotes.

Whenever I attempt to change a Kontact setting (such as ‘Show component sidebar’), the change is not saved and I’m getting the following message on the console:

Communication problem with KNotes. Error message was: “org.freedesktop.DBus.Error.UnknownObject” : " “No such object path ‘/KNotes’” "

I installed KNotes, but that didn’t help either.

Edit: I filed a bug.

Turns out this will be fixed once Remove QDBusInterface about knotes (44fa501b) · Commits · PIM / Kontact · GitLab hits a release.