Menu keys read incorrect alt-prefix with NVDA and Narrator

1. Start screen reader, either NVDA (I'm using 2019.3.1) or Windows Narrator
2. Open an application built with Qt that has a main menu (I'll use Qt Creator as the example)
3. Alt+F to open File menu, then down arrow to a command that has no shortcut key, but does have an underlined letter (in Qt Creator, "Open File With..." is an example, with "W" underlined
4. NVDA says: "Open File With, Alt+W", Narrator says: "Open File With, Menu Item, Menu Key Alt+W"

The "Alt+W" part is incorrect. It should be saying "W". If you hit Alt+W you'll open the Window menu, not activate that menu item. Same problem with any other command.

Compare with notepad.exe, where File / Page Setup reads correctly.

JAWS 2020, on the other hand, works correctly in both Qt Creator and notepad. I suspect JAWS is special-casing this (looking for and ignoring "Alt" when it detects a Qt-based menu) because when a menu item has a shortcut such as Alt+Ctrl+X, it just says "Ctrl+X". I will pursue that with JAWS and see if that's the case.