What I did: I cut-and-pasted two paragraphs from one note into another, and rewrote a new single paragraph in their place in the original note, with a new heading. this was on my macbook pro
What happened: later that day I looked at the note on my iMac (which had been shut down), and found the new paragraph replaced by the two old ones, but under the new heading. this change was also on my macbookpro where I had made the edit earlier!
What I expected: not to lose the new paragraph I wrote!
Things that might be helpful to know (Agenda version, OS and model, etc): Agenda version 7.0, macOS mojave on the macbook pro, macOS catalina on the iMac, sync through icloud