this flashing happens when a person sitting in a boat gets hit by falling sand if they dont know they can crouch to get out in survival mode u can never escape relogging puts u back in the trap this is gamebreaking for multiplayer servers and if this happens accidentally u could lose ur world its also really bad for people who have problems with flashing
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I can confirm, using the way you did in the video, the falling sand goes up and down
I think this is related to MCPE-158745