Hiii, idk if im the only one with this problem, but I guess this happens when you take all the more aggressive options with Milo or something because literally I have another file when I take all the more soft option with him (Romance him) but after you found him in the aqueduct and talk with him, I also clicked in the option him escorting MC to the exit and there is also a bug or something where you can't continue the story.
In the pic is other part of the story (with the same characteristics I write before) where there is not "Next" part