Contacts Application: When typing in the notes field, cursor disappears, can't add notes
This issue was addressed with the exact same question on April 7, 2021. It was unresolved.
I have been having the same issue for months. Since I have been using Contacts as a sort of “poor man’s CRM” for many years, with Notes within the app serving as a general information field, this is an exasperating problem. Sometimes the cursor disappears, making text impossible to enter, so frequently that entering data becomes a chore—the opposite of what one uses a computer for. If information is entered without looking at the screen (a normal and frequent occurrence), dozens of keystrokes may be entered before the loss is detected.
Since Apple has not provided a solution, I have resorted to entering the data in another app (usually TextEdit) and copying and pasting it to the contact where it belongs. It isn't an elegant solution, but preferable to constantly having to re-key information.
Note: it's a good idea to write long emails into TextEdit or another such app for similar reasons. We've all been victimized by losing emails after spending time composing them, haven't we?
Mac mini 2018 or later