How to PUA encode an existing font?

I believe this is a languagesystem issue. I just tested two versions of a font of mine. The first one had

languagesystem DFLT dflt;

and the second one had

languagesystem DFLT dflt; languagesystem latn dflt;

As you can see from the screenshot below, Word needs the latn dflt bit for the OpenType features to work. All text has ligatures enabled.

Glyphs used to add both lines automatically, but now only adds the first one. This problem has been around for a while:
https://forum.glyphsapp.com/t/opentype-features-ms-word/

@GeorgSeifert and @mekkablue, is there a reason Glyphs stopped adding the latn dflt line? Is it possible to revert the previous behavior?

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