>>23321582To be more specific, it's the female part here of one of the connectors for the thrusters.
It's basically the same issue as with Lego minifig arms where if you rotate the hands inside of them it feels like as if there are certain positions where it becomes harder to turn them. If you leave them in those the part will split after a while from the internal stress resulting in hairline cracks.
So, in case you have one of those figs: better rotate them into a position where it doesn't feel as if the peg is going to pry the walls of the piece apart.