Please share a sample document at email@example.com with which the issue is reproducible along with a small video showing the steps.
To my surprise the problem with the disappearing cursor has disappeared one day later! I Don’t know why, but it works now as it should. The only thing I can remember to have changed is the Mac Mojave font display as described here: https://blog.macsales.com/46143-macos-101-what-mojave-broke-and-how-to-fix-itAndreas commented
I have a similar problem: Hovering with the selection cursor (the black one) over a text box is fine, but when I click the text box, the cursor disappears. Moving it away from the box it is shown, but over the box it disappears. A 'blind' double click on the box shows the text cursor, which then works fine.
Mojave 10.14.2, InD 14.0.1