Keyboard shortcuts cannot be bound to custom scripts

[RJWoodhead]

The documentation claims that custom commands can be bound to keystrokes, but the described method does not work. If you follow the instructions and create a custom command (such as the example "convertSelectionsIntoLength") and bind it to a key, the keyboard shortcut does appear -- in the shortcuts editor, you can type "shift+alt+cmd+n" and "texty.custom.convertSelectionsIntoLength" will appear.

However, when you attempt to invoke the function via the keyboard sequence, you get "command 'texty.custom.convertSelectionsIntoLength' not found".

The function is available via the command menu and executes as expected. The only problem is that the command cannot be executed by a keyboard shortcut.

Edited to add: I am quitting/restarting VSC after each change to any of the configuration files.