I created a machine to get flowers by bone-mealing grass and shifting it side-to-side. Game can't handle whether to move the pistons or to use the dispenser for some ticks and crashes. Furthermore, the pistons themselves aren't consistent and sometimes they don't trigger.
I recreated the behavior on creative and attached some print screens of it.
Thank you for your report!
We're actually already tracking this issue at MCPE-53033, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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