It depends on your point of view.
All saw was fans celebrating another PL title win and the 3rd in a row.
They went on the pitch in an orderly, but enthusiastic manner, celebrated for 10-15 minutes, and then went back to their seats. Done.
As far as I could see and tell there was no trouble in-front of the away fans, there was no trouble with the stewards, no City fans tried to break the stewards cordon in-front of the Main stand, and the goal at the SS end was intact, even though some people says one or two fans were trying to get to it.
The presentation went ahead without any problems. The players celebrated the title with the fans in-front of every stand, especially the South stand.