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.
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.