I opened one of my beta worlds, which ran fine until I held the right trigger button to harvest sugar cane quickly. After the first crash I tried again, hitting the button once per stalk, but it still crashed. I loaded again, walked away, and swung at a spider, crashing the game. I loaded one more time, and collected one piece of birchwood before the game crashed. The game appears fine as long as I don't use the trigger button.
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We're tracking this issue in MCPE-128985, so this ticket is being resolved and linked as a duplicate.
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