Erroneous(?) "glyphs missing"

[simoncozens]

I'm not sure what the "glyphs missing" message means. It doesn't seem to mean that the glyphs are missing...

$ fontdiffenator -td glyphs -- Nunito2-fontmake.ttf output/test.ttf
...

****glyphs missing: 146****

glyph               area                string
A                   -76210              A
I_J.loclNLD         -63701              IJ
Iacute_J.loclNLD... -79427              ÍJ
a.ss01              -65988              a
...

$ shape output/test.ttf 'A'
[A=0+716]