Actually on balance this is pretty minor - seems you can Enter-complete now instead. Would be nice not to have to re-learn the different significance of Enter, but if this isn’t wontfix, probably legit.
While I’m on the subject though, is there any way you could make the completion list re-appear if the cursor is brought back to the end of a word that starts with @ ?
Far too often I’m typing “@app.py” in flow and hitting space, only to realise it didn’t count as a reference because I didn’t do the magic key dance (used to be Tab, now Enter). That means having to backspace backspace backspace backspace backspace backspace backspace backspace and retype the whole thing starting from @. Would be nice if a single backspace would pop up that menu and allow it to be made into a real file reference.