The suspected driver has been arrested, according to police. According to information from the German Press Agency (dpa), the man is injured and in the hospital. He is said to be a German citizen. Currently, police do not believe there were any accomplices, as the dpa learned from security sources.

https://www.handelsblatt.com/politik/deutschland/mannheim-auto-in-menschenmenge-gefahren-laut-sicherheitskreisen-zwei-tote/100111131.html

Issue still present after 30.0.1 update. One of the core features to send email shares is broken for more than a month. Not impressed at all.