When you get near a lava-fall, you will see things like your character became taller. I don't know how to express it, but it feels like your pov rises. Hope that's undestandable. You can see it out by yourself if you try getting near a lava flowing from the roof.
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Thank you for your report!
We're actually already tracking this issue at MCPE-51142, so I will resolve and link this ticket as a duplicate.
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