Minion 3: Russian stress mark (accent) flawed on some vowels?

[tom.deherdt]

While testing Minion 3 for linguistic work (IPA, polytonic Greek, Cyrillic, ...), I noticed that the stress marks on some Russian vowels are off.

Russian is not normally written with accents, but stress is indicated in dictionaries, language courses etc. [cf. https://expressrussian.com/russian-letters-with-accents]

Accents are written by adding a combining diacritical (U+0301) after the vowel. This works fine with common web fonts (Cambria, Calibri, ...):

А́ Е́ И́ О́ У́ Ы́ Э́ Ю́ Я́
а́ е́ и́ о́ у́ ы́ э́ ю́ я́

When I paste these combinations in the test tool for Minion 3 [https://fonts.adobe.com/fonts/minion-3], the accent is perfect on а е и ы and у, but clearly flawed on о э я and ю (see attached screenshot).

Is this an artefact of the online test tool, or could it be a bug in the actual typeface? If so, will it be fixed in the (near) future? Without proper accents, Minion 3 cannot be used for didactical or linguistic publications on Russian. That would be a pity, since it seems to be one of the rather few typefaces that combines professional quality with a large range of characters useful for linguistics.

[tomd65897246]

Apparently, anchor points are missing on some vowels. This is easily fixed in a font editor (it took me 20 minutes with FontForge, without any prior experience with font editing), but that is not really a solution due to licensing issues etc.

Does anyone know how to contact the right person so this issue can be fixed in a next release of Minion 3? I find it  hard to imagine that the designer who created Minion 3 would not want to fix this, since it's such a small bug, that nevertheless makes it impossible to use this versatile font for dictionaries, textbooks, linguistic texts etc. that have a genuine need to indicate stressed vowels. Thanks.