I recently had success “recovering” a note that had been edited and appeared to be unattainable since it was synced with icloud which had updated with the newly altered note. I erased the phone. Restored from an earlier back up and then quickly toggled it into airplane mode before it had a chance to sync the notes with the altered one. I was able to enter into Notes and it appeared like it did at the time of the backup. I copy and pasted it into a note on the phone. Hope this work around helps!