They are very flimsy and when they do break they could easily blow away at speed!
So it might not have been pinched but lost.
I was lucky when mine broke off in the garage.
Very easy fix to repair with a drill and a couple of nuts and bolts, there is a Youtube video showing how to do it.
If I had to buy a new cover I would be very tempted to do the nut and bolt conversion for extra peace of mind