"Automatic by Language" settings does not work with 3rd party spelling dictionaries

System preferences -> Keyboard -> Text(tab) -> "Automatic by Language" settings does not work with 3rd party spelling dictionaries.

I've put my Lithuanian language spelling dictionary into ~/Library/Spelling (lt_LT.aff, lt_LT.dic)

Yes, i've done "Set Up..." which is last option language selection.

Yes, i've only check-marked only those(two) languages that i'm interested(English, Lithuanian).

Yes, i've dragged them to the top in following order:

1) Lithuanian

2) English(U.S. English)

Please see screenshot

Yes, i switch keyboard layout in the document to a language layout i indend to use.

I've chosen option Spelling and Grammar -> Check spelling -> While typing.

And it fails. It underlines words in red.

When i ask to present me with correct options, it presents with the list and in this list there are those exact words, presented in the same way 1:1, but somewhy when i type it things it's wrong.

Please see screenshot

Why is that and how to correct this ?


By the way everything works perfect if i deselect "Automatic by Language" and choose one language, thus everything is ok with spelling dictionaries.