It's good they had a successful launch and landing. From the blurb, it seems the fire came from methane fuel venting or leaking, and is actually considered normal?
I think after so many failed landings with Starship, the pressure was starting to creep in for SN15 to work. Fortunately, whilst NASA, ESA, Russia, China etc are very good at launching rockets, nobody it seems is better than Space X at landing them.