Catalina has a horrible BUG in the notes application. It doesn't sync data to iCloud unless restarted. It is simple to prove. Write a note with an ipad open to notes. nothing you do in notes will cause it to sync. Close notes and restart it and the sync will happen.
Unfortunately it is too late for me to recover the two hours worth of notes which I lost due to the bug with icloud in system preferences (I had to logout and then login again. Told it to keep copies of all my data but it still threw away everything in notes including… you guessed it… everything which it hadn't synced.