Missing superscripts in Linux Libertine G Bold 5.0.3
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The superscript has lookups for hijlnqrswxy but not abcdefgkmoptuvz
The glyphs for inx are bold, the remaining glyphs are only regular weight.
The missing glyphs cause problems for using Ordinals with Bold text. If the user types March 7th, for example, only the h is superscripted, not the t.
Just for the record, I checked this issue against the Libertinus fonts fork. The situation has improved (all letters have +sups lookps), but there is still a weight issue in that not all of them are bold! I've opened a corresponding issue there. Given that this project is unmaintained, I invite you to check out those fonts. Even before this issue is fully fixed, many other issues have been addressed.