How do you disable russian-ukrainian transliteration?

I've looked at forums, support, feature requests but nothing works. I want to disable transliteration - predicting the act of vandalism against the language I am using, invented in Microsoft-owned (and ruined) SwiftKey. Problem: I type in Ukrainian "we", "ми". It immediately corrects Ukrainian word into Russian "мы" despite: A) letters being in absolutely different locations B) me typing in UKRAINIAN language, and not switching to Russian at any point C) me disabling this prediction many times already There are other similar predictions, but the case mentioned is the most frequent. What I want: an option not to predict words that have letters not found in the keyboard I'm using. To ONLY predict words from the SAME keyboard I am using. Hopefully, this is clear enough, as it wasn't clear for the last 3 years after the feature was requested. Maybe it was requested prior, but I found a long list of requests to disable this nonsense starting 3 years ago, which was "fixed" yet the option is missing for a lot of people, myself included.