Filter List Using Unicode Glyphs

I thought I saw an update somewhere that said you could now use unicode glyphs in the filter list? I’m having problems however where glyphs that exist are returning as not existing?

I created this list filter

And on this file, when I go to the filter, it says ! is missing when it is in the file? Are there specific glyphs we need to write out as names instead of unicde, so far I’d assume /space/comma/slash need it?
New Font.glyphs (8.0 KB)

Yes, I would avoid the ASCII symbols.