Karun is right. Hamilton screwed up but Ferrari probably should have tried to have him correct it to avoid penalty. Double face palm.
The problem was that when Ham cut the course, Max lifted to show the former was getting an advantage.
I didn't know that. But Ham also didn't follow the procedure to rejoin which would have been longer than cutting across the grass.
I didn't say he did. I'm saying the stack up behind him was because he was lifting to give Ham space to reenter the track safely, which showed that Ham was getting an advantage.