We did design this specifically to have players succeed in finishing maps in order to acrue progression on these milestones/challenges. It’s counter intuitive to have it any other way from our perspective as we don’t want to ever encourage a map to disband early. Any started map should be finished, or failed through legitimate failure (ideally).
edit: I suppose a counter argument might be that a legitimate fail is still an attempt, and could well happen right at the end of a map, at which point shouldn’t it be sage to reward people in some part for their efforts? Sadly we can’t determine what a legitimate fail is versus an intentional one, and we made a game that’s supposed to kick your butt a bit, and rewarding success (and not failure) is our MO!