I discovered that if there is a number (or single digit) in a menu item, that a matching single digit as a "mnemonic" entry in the menu item works to activate it. Here is an example (and they actually do work):
However, the scope that it is being given includes invalid.illegal.expected-string.sublime-menu Scope Name, and I think this might be causing it to be highlighted in red, when it is not, in fact, an error.

I discovered that if there is a number (or single digit) in a menu item, that a matching single digit as a "mnemonic" entry in the menu item works to activate it. Here is an example (and they actually do work):
However, the scope that it is being given includes
invalid.illegal.expected-string.sublime-menuScope Name, and I think this might be causing it to be highlighted in red, when it is not, in fact, an error.