Huh. So it does. I could have sworn it didn’t the first time I tried it…
But anyway, that’s beside the point. There are many cases when not being careful with your んs produces a legitimately different word, like say, 原因 becomes 下人, and the IME ain’t gonna help you with that one. Get into the habit of using nn or n’ now, while only the durtles are judging you.