Debug mode doesn't respond to F10 key

Just like the title says, debug mode doesn't respond to pressing the key F10 to step over while debugging. F5, F11 (etc) all seem to work normally... it's just F10 that's unresponsive. It was an issue in 4.8.x and has thus far consistently been an issue for 4.9.0.

This looks exactly the same as a related issue in previous versions: QTCREATORBUG-174, QTCREATORBUG-6409, QTCREATORBUG-6924. Unlike 6924, though, Pressing Alt-D + F10 doesn't work. When I open the Debug menu I notice that F10 appears to be registered twice for two different actions. See attached Screenshot1. It's worth noting that activating the first action from the menu while already running a debugging session starts a second debugging session on a new instance, putting the first debugging session into an error state and confusing CDB.

On a related note, the hotkeys no longer appear in the debug action buttons. I don't know if that's relevant. See attached Screenshot2.

My debugger is CDB if that matters. I have a pretty minimal installation of QtCreator with just the TODO and Git plugins.