you will probably have to turn around after spawning
I have also seen the duplicating pistons where a piston pushing another piston will either duplicate the pushed piston OR push the pushing piston back destroying the block behind it.
I have always run minecraft completely unmodded.
Also I have learned that while the game is in the middle of lagging i.e. it takes me 60 seconds to move 8 tiles in a powered mine cart, that mobs are not experiencing this lag at all. I was sailing by a beach well out of range of skeletons and lagged with a nice little picture of 2 creepers and 3 skeletons on a beach staring at me. by the time I got my split second of control after that, I was dead from both creepers swimming out after me and blowing me up in my boat. then I had to wait 10 more seconds just to push escape to exit/save my game. the lag effects the game in and out of menu.
thank you for taking the time to address my problem.
yes. yes it does, but thank you for pointing out my java platform was out of date.
here is a save file with a double piston door that is now duplicating pistons