i had something similar where i rolled off at the wrong place, and whats happening here is i think we both got stuck on some inivisible barriers, but for how you got stuck there i can only assume is there is an invisible barrier in the middle that you can only pass through when you are launched by the piston, but since you got stunned it interrupted your piston launch, therefore getting you stuck there
MCD-2869
i had something similar where i rolled off at the wrong place, and whats happening here is i think we both got stuck on some inivisible barriers, but for how you got stuck there i can only assume is there is an invisible barrier in the middle that you can only pass through when you are launched by the piston, but since you got stunned it interrupted your piston launch, therefore getting you stuck there