Button editing - Mac Rhino vs Windows Rhino

When you shift + right click to edit a toolbar button in the default library in Mac Rhino, the actual command area is blank. Why is this different from Windows Rhino where the command is filled in?

It’s a bug https://mcneel.myjetbrains.com/youtrack/issue/RH-79555/Button-editor-starts-off-blank

Ah, thanks - odd bug !