Hello Chris, this is usually caused by a spun shell, my view is that the shell spins in the con rod & without lubrication to the outside of the shell it overheats. (will probably want a new con rod & crank re-grind/replacement if there’s no bearing left).
Tony, I’ve done a few of those 2.2 puma engines with cracked pistons caused by a faulty injector. You can see a perfect bore hole through the piston centred to the injector tip.