This occasionally happens when you climb a set of stairs in a taiga village, and it can happen when you climb the stairs of a taiga village and then jump from the top platform to another platform, which the player is not supposed to receive fall damage. It also happens when you barely walk off a block that is at least 3 blocks high.
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We're tracking this issue in MCPE-120140, so this ticket is being resolved and linked as a duplicate.
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