As the title says:
Opened a new project.
Used the existing document (blank).
Changed font.
The text cursor disappeared.
It’s still there – I can type, and things are back to normal. But clicking on the document won’t give me back the cursor.
If I have even ONE letter in the document, the text cursor does not disappear like that.

This is not a terribly impressive bug, of course. It’s just annoying.