Capital ö and ü characters are missing in Italic versions of Duo and Quattro

[Ulvican Kahya]

Hi! I have installed all of the fonts, both static and variable versions, on Windows 11

With non-italic types everything works fine.
But when I use italic versions, Capital ü -> Ü and capital ö -> Ö only creates a whitespace.

This only happens with Duo and Quattro fonts. With Mono they appear as expected.

I have tested using Windows 11's notepad and MS Word

And also in Windows 11 Font Settings: