Hi, On my iMac with OS X with 10.15.3 all of the notes have disappeared. It wound up syncing with my macbook, iphone and ipad and all the notes are gone.
I went to icloud prefs and unclicked Notes…then went to Time Machine and copied the notes files from a month ago. I open the notes app and see all the notes and within seconds they disappear.
So iCloud is turned off but something is interfering and wiping out all the notes from the Library files.
Any thoughts…a lot of informations is gone.