I thought I had reported this on bugzilla, but apparently not.
With Audacity 3.0.2 on my Macbook Air macOS 11.4 …
Open a project with at least one audio track.
Click in the Project Rate box in the Selection Toolbar so that the editing cursor is visible there.
Do any keyboard shortcut that involves the shift key (eg Cmd+Shift+A, Cmd+Shift+F, Cmd+Shift+C, etc).
The keyboard shortcuts editing window opens.
Dismiss the dialog then click in the track.
Do any keyboard shortcut that involves the shift key.
The command is implemented, if appropriate.
If I remember correctly this relates to a feature that was implemented several versions back. The intent was that a user could quickly open the keyboard shortcuts editing dialog by adding the shift key to any valid shortcut. So, for example, since Cmd+A is Select All, hitting Cmd+Shift+A would open the dialog. Except that Cmd+Shift+A is a valid shortcut (Select None). Note that when you do Cmd+Shift+A in the example above, the keyboard shortcut editing dialog opens with the Cmd+Shift+A shortcut selected.
Furthermore, the feature does not work when you add the Shift key to a valid keyboard shortcut. With a “dirty” project (one for which the File > Save Project > Save Project command is available - shortcut Cmd+S) hit Cmd+Shift+S - nothing happens.
The simplest solution - in my mind - is to disable this “feature”.
I cannot get this to happen with Shift+K, so maybe it has something to do with the Dvorak keyboard?
I have a question: How do you using any command-key shortcut when the command key is used to switch the keyboard to QWERTY?
I added a few years ago a feature for quick change of key bindings when you hold the Shift key while releasing a toolbar menu item. But it misfires on Mac sometimes in circumstances I don’t fully understand.