[mcv]

Maybe Luxembourgish doesn't have an uppercase ẞ?

Dutch is also not supported. Presumbly no support for the 'ij' digraph. But do you even need that in a monospace font? Admittedly old Dutch typewriters used to have a single character for it, but that's really old-timey.

[dsevil]

I didn't want to even try to mess with ligatures in a monospace font though I did œ and Œ and for WGL4 completeness IJ. So yeah I'll do ij as well...