I’ve been beating my head trying to change something that will get my predictive text to show up on iOS the way it does on the Android. I use the same 2-letter language code without Script extension for the keyboard, the lexical model, and the interface language. (I did find that when I was using the 3-letter code for the interface language, which I had been doing long before the keyboards came along using 2-letter codes, on iOS that caused the keyboard itself not to appear.)
But I’m wondering if this functionality is actually implemented on the iOS side. @ChrisHubbard, should I be able to see predictive text there?