(Note RE the "fonts with the same name" setup here - the user-facing font name may differ, but the issue seems to happen when internal hidden fields in the font itself declare it to be the same. E.g. in bug 1771496 comment 45, we have a font that's called "Brady Bunch" but which internally has "Arial" and "ArialMT" in some of its name fields.)
Bug 1803406 Comment 3 Edit History
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(Note RE the "fonts with the same name" setup here - the user-facing font name may differ, but the issue seems to happen when internal hidden fields in the font itself declare it to be the same. E.g. in bug 1771496 comment 45, we have a font that's called "Brady Bunch" but which internally has "Arial" and "ArialMT" in some of its name fields, and that naming [combined with other Arial/ArialMT fonts on the system] is what causes trouble here.)