JuliaMono freezing ss10 not working when other variant glyphs work

[Timwi]

Using this command line:

pyftfeatfreeze -n -f cv01,cv03,cv04,ss10,ss03 JuliaMono-Regular.ttf freeze\JuliaMono-Regular.ttf

I get this output:

J.alt j.alt l.cv04 three.cv01 asciitilde.cv03

Note that

• cv01 activates the variant glyph for 3
• cv03 activates the variant glyph for ~
• cv04 activates the variant glyph for l
• ss03 activates the variant glyphs for j and J
• However, ss10, which should activate the variant glyph for r, is being ignored.

This is not a problem with the font file because the same operation works on FontFreeze where it freezes the variant r glyph correctly.

The version of JuliaMono used is 0.055. The same problem occurs across all the weights and styles (regular/italics).

Here’s the generated output file. The Windows font previewer shows the correct variant glyph for l, j and 3, but not r.