https://imgur.com/a/PwCb6Un One of them is a screenshot the other 2 are a picture of my monitor because that was easier. I hope you can recreate the glitch with this. I also updated the engine with a cover over the spark plug to prevent it from being pulled. I also apologise for my long reaction time. I cannot check my phone that often.
I have now discover that the problem can only occur during the combustion event. If i remove the spark plug and ignition cannot occur then the piston cannot pull the head down. I am currently working on a save that produces the undesired effect semi-reliably. I will update this message with the save once i have made it. I also do not recall having downloaded any type of mods, but i will reinstall the game in case that's the problem wich i doubt because the glitch still occurs on my phone , the web version and on my laptop and It happens wether im logged in or not.