Checked menu items, especially those with icons, look odd with the windows11 style. I suspect this part of the drawing code was borrowed from the old windows style and never updated for windows11:

For comparison, this is how a Windows 11 menu looks (right click on Desktop -> View submenu):

I don't know how closely you intend to match Microsoft's styling but even if it were going for something more like this, I think it wouldn't look as strange:

That's from the bottom right of Explorer on the status bar which I believe isn't using updated WinUI styling, but if that is easier to implement, at least it wouldn't look quite so out of place. Or this which is a mockup provided by one of my app's users: