The tie curves downwards because not all of the notes in the chord are tied, so the tie direction is determined by the rules for single ties around the middle line of the staff. I agree that it does look better in this case to curve upwards, but at the moment you will have to flip the tie in Engrave mode to achieve that appearance.
OK. Thanks for the clarification.
But the middle line does not seem to be a “divider”. I would have to go up to E to have Dorico react.
Could this be on the “To-do” list for an update? Flipping in Engrave mode is not a problem, but it would be nice to have it done automatically (and consistently, which a human isn’t).