2 years ago we (group of 6) were booked PVG-DOH-TXL on QR in J.
planned for an overnight in Berlin to catch a flight to MLA to start a cruise.

Flight from PVG was delayed 4 hours due to ATC restrictions. When we arrived in DOH were told that they rebooked us for the next day flight to TXL. I explained to them that we would have to catch the flight to MLA or we would miss the cruise.

We were then rebooked on the QR flight to MUC and connection to TXL on LH in C as well, QR also provided rooms and transport to a hotel in Doha and food vouchers at the hotel.

Was very happy with their service, considering that the connection to MLA had nothing to do with them and was on a completely different ticket.