In 1.13 the player hight was "fixed" to match java edition, it went from 1.9 to 1.85 blocks tall, because of that the hand is lowered a lot. That caused some bugs with the off hand, if you have a map in you off hand sometimes the map renders off screen
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Thank you for your report!
We're actually already tracking this issue at MCPE-47877, so I will resolve and link this ticket as a duplicate.
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