Notes on mac not syncing - do not toggle iCloud settings!
In several community discussions on syncing issues between Notes and iCloud there is the advice to check the iCloud settings in System. Sometimes there is the suggestion to toggle iCloud sync to trigger the syncing. I tried this and immediately lost all non-synced local information, either updates on existing notes or entire new notes. This represented several hours of typing and preparations, and a severely frustrating and I would think unnecessary loss, if Apple could get their systems in order. So, a kind advise: if you have problem with Notes on your Mac not syncing to iCloud, despite settings showing that it should - do not toggle the syncing button in System settings for iCloud.
And, if someone has an idea on how to recover the lost local updates I'd be very grateful.