In the add cards dialog, when the tag autocomplete dropdown is still open and I press Ctrl+Enter to add a card, the dropdown stays open and I end up with two cursors active at once.
Here’s a GIF demonstrating the issue:
Windows 10, Anki 2.1.35, Python 3.8.0, Qt 5.14.2, PyQt 5.14.2. If I remember, I’ll check to see if this happens on my other machines as well.