I don't see a way to take the last star. Perhaps you made a mistake and instead of a straight rail, you put a curved one (at the top near the win block). Then there will be a sense in the autoslider near the win block. I think that's exactly what you thought.
@Denis Nazin There is a way to get it: So when you get near the end you tap the star, when you get to the end, you tap the star first before the finish
@DropoutsAlternative The mekorama app has one strange feature!! You are the author on your page (where you build levels!) - on this page you can sometimes get a star after a win block. But!!! This can only be done by you and only on the construction page!! Try uploading your level on the user levels page - and you won't be able to get that star after a win block.