Whoa, ran across a bug in macOS Core Graphics’ glyph renderer. Looks like they missed some active edges on that left scanline :)pic.twitter.com/7MbGzDUUB1
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Freetype made an incompatible change a while back in how glyph extents are defined for subpixel glyphs. This is very likely related. Workaround for me was just turning off subpixel.