When the dispenser is looking at the grass and inside it has bone dust, when activated to release the bone dust the game stops and closes, this error also erases the progress of the player in the world.
In realm, the player's progress is deleted when the dispenser is activated. In off-line maps, this error causes the game to close.
(In the image there is a demonstration of how to activate the error.)
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We're already tracking this issue at MCPE-53033, so I will resolve and link this ticket as a duplicate.
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