I don't know the internals of KDE so I may be way off here, but I have a
hunch that this is caused due to kbuildsycoca5 being missing in Debian sid.
I checked the package kdelibs-bin and it doesn't provide an upgrade to v5.
Package: systemsettings
Version: 4:5.3.2-2
Severity: grave
Justification: renders package unusable
On Debian sid, after upgrading to systemsettings:4:5.3.2-1 and even after
upgrading to 4:5.3.2-2, everytime I open System Settings, it gives me an error
popup saying "System Settings was unable to
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