I was making a multi-directional flying machine and in one circuit I had an observer be pulled by a double piston extender then it would fire the sticky piston multiple times and it is turning to stone now.
I am not sure if it's the observer or if it's that the piston is trying to fire and be pushed at the same time.
I also don't know if it's the same with normal pistons.
ps Sorry here is the world download
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This is now crashing my world.
So when you now export the world it will crash the world.
To fix just rebuild with the correct timings again beside it to make the actual bug happen.
I tried your world, and crashed before the stone block even appears at the first test.
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Actually, this appears to be a duplicate of MCPE-28260.
We need to be able to reproduce the problem in order to study it. There really isn't enough detail in your description or your screenshot for us to be able to reproduce your device, and the problem clearly depends on us reproducing the exact timings you have. Could you please attach a world download from before the problem happens, and tell us how to activate it to reproduce the problem?