Did you ever find a solution? I updated from 3.4 to 4.5 and now I’ve got the same issue, just with even more entries.
(The issue is not related to Tidings…)
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Found the solution: the apps “Piepmatz” and “Fernschreiber” created desktop files that were not removed after uninstalling the apps. Manually removing these files and rebuilding the cache fixed the problem for me.
cd ~/.local/share/applications
# remove entries for deleted apps
rm -vf open-url.desktop # duplicate Browser entry
rm -vf harbour-fernschreiber-open-url.desktop harbour-piepmatz-open-url.desktop
# rebuild the cache
rm -vf mimeinfo.cache
update-desktop-database ~/.local/share/applications/
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