Custom list in spellcheck (Russian)


I am trying to extend the Russian spellcheck dictionary with new words. I’ve added them to “spelling_custom.txt”, and they seem to no longer be marked as typos; they, however, don’t appear as suggestions when I write incorrect forms.

Did I miss some steps in the process, or does this feature not work for Russian?

I cannot reproduce this problem is English or German, and I don’t see a reason why it shouldn’t work for Russian. But there might be a bug.