unicode-ranges for Noto Sans missing U+0307 and U+035F

[HMPerson1]

Describe the bug

In the Google Fonts CSS v2 API response for Noto Sans (https://fonts.googleapis.com/css2?family=Noto+Sans), the code points U+0307 and U+035F are not listed in any of the @font-face unicode-range entries, despite the fact that these are included in Noto Sans (according to https://notofonts.github.io/overview/ "Combining Diacritical Marks").

Interestingly, if &text=u%CC%87 (or similar) is specified, the corresponding font file does include U+0307.

To Reproduce

1. Go to https://fonts.google.com/noto/specimen/Noto+Sans?preview.text=u%CC%87#styles
2. Observe that "u̇" is rendered correctly
   • This is because the page requests the font with &text=u%CC%87, which can be confirmed in DevTools
3. Click on one of the rendered samples to open the text input field
4. Observe that it becomes tofu
   • This is because the page requests the "full" font, which is missing U+0307

(same issue with U+035F at https://fonts.google.com/noto/specimen/Noto+Sans?preview.text=t%CD%9Fh#styles)

Expected behavior

The CSS response includes the code points U+0307 and U+035F

Screenshots

Initial page load

After activating the text input field

Additional context

I needed these specific combining diacritical marks because they're used in Merriam-Webster's pronunciation transcription system and do not exist as "precomposed" unicode code points. There may be other codepoints missing but I haven't looked further into that.

Chrome 131.0.6778.205
Windows 11 build 22631.4602

[emmamarichal]

I can reproduce, thank you @HMPerson1!
cc @simoncozens

[simoncozens]

This is a known subsetting issue. We can't currently reliably combine Basic Latin with Combining Diacritics because we haven't worked out which subset to put Combining Diacritics in to make it work. (@nathan-williams @garretrieger)