Super Heavy launch vehicle with 33 engines.
At one moment in the flight, 9 engines were not functioning.
Vibration is a big problem. Trying to smooth out the shakes, with so many rocket engines - some working, some not working well, some not working at all - is seriously tough.
Forces on the rocket structure, trying to tear and twist that structure, alter the efforts made to stabilize flight.
Some destruction can include very undesireable thrust events - and that appeared to be occuring soon after launch.