epaint's has_glyph compares face keys, so a glyph drawn by the replacement
face reads as missing. With no face in the stack covering egui's `◻`, Inter's
`?` becomes the replacement and Inter's `•` fails the check, which happens
once another test (the #1141 one) has loaded a system face without `◻`: the
fallback tries loaded faces first. Compare the drawn glyph with the
replacement glyph instead, as assert_drawn already does.