I have a user in Russia saying that when he clicks a text field in my app (either a UITextField or UITextView), on his iOS 12.0.1 iPhone, his on-screen keyboard only displays the English alphabet and the globe icon for switching keyboards no longer appears (just the emoji button). He sent screen shots showing that this isn't a problem in Apple apps and other third-party apps. And he says the problem just started a few weeks ago.
I've released a few updates in that time, but I looked at my code diffs and don't see anything that seems related to this, nor am I aware of anything my app could do to affect this if I wanted to. I enabled the Russian keyboard on my iPhone and the globe icon appears for switching keyboards as expected.
Does anyone have an idea of what could be happening here?