update: I have check spelling on under settings for both keyboards.
Please try and not misunderstand this question. I'm NOT talking about the white background word suggestions white typing.
I believe before iOS 10 if a word had a red squiggly if you tapped it you would get a black tooltip with a suggestion.
Can this be somehow turned on again? I don't see anything on the web even mentioning it, it's like noone noticed it! (The black tooltip does show up still but only in the case you type a word and hit backspace.)
I can add screenshots if you guys need it.
Like I've mentioned in the comment to the first answer, I have check spelling on.