Nope, bug was in rendering code, the bitmap got interpreted as a mask. It works now.
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Poking at fonts, I found an svg color font that happens to have sbix tables... Except the images inside are of fully black letters with an alpha channel, and sbix images are supposed to be interpreted as premultiplied, meaning these are fully transparent... 🙃
Given it is an svg color font as well, I'm just not going to bother with it until I'm ready to do svg support, but it does bother me greatly.
Edit: sbix is not pre-mult, only cbdt is...
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