Darmstadt 98 is shown as the winner of last season's 2. Bundesliga even though Heidenheim won the championship. They were equal in points but Heidenheim won with Goal Difference
https://www.bundesliga.com/en/2bundesliga/news/regensburg-heidenheim-live-team-news-match-stats-schmidt-maloney-kleindienst-promotion-23596