I have developed a sort of work-around. Try the 12.2.4 beta that I just posted.
See the new option at the bottom of the General Tab of the Notenik Settings, for “Inlined Editing of Long Text Fields.” Turn this off in order to see the work-around.
I hope that others (@ThePrinter, @wgrace, etc.) will give this a try as well.
When you turn this setting off, then each multi-line text field (other than the Body field itself) will be presented on the Edit tab as a single line of text, followed by an Edit button, which will open a new window for editing of that particular field.
I will be interested to know what others think of this. I think I actually prefer it to the old (aka inline editing) option of these long text fields, and I think I would probably continue to prefer it, even without the disappearing cursor problem: it makes for a tidier Edit tab, it provides more room for the Body field, and it allows for cleaner tabbing from one field to the next.
Looking forward to feedback!