This seems to be a Windows 11 specific problem, at least not reproducible in Windows 10.

When High DPI scaling is enabled ( i.e. QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling)) and system's display scale ((System > Display > Scale & layout > Scale) is set to 150% or 175%,
some of the characters of the text are not drawn.

The below is output in Application output.

"QWindowsFontEngineDirectWrite::addGlyphsToPath: GetGlyphRunOutline failed (Parametro non corretto.)"

How to reproduce
Qtbug108204-testFontScale.zip