Thanks, I tried the same and it works!
I also did something similar to fix the same issue on macOS. Just delete the database files in ~/Library/Group Containers/B227VTMZ94.group.com.toggl.daneel.extensions/production (DatabaseModel.sqlite and others). Open the app (reinstall if needed) again and let it resync, the issue disappears. Probably the new OS version dropped support of some older sqlite databases or deprecated feature sets, so a new local database has to be re-created