When in a certain angle and position inside a lava waterfall, you can see the things behind the lava! You need to find the exact position for this bug to appear. Screenshots below. I included the fire and some of the lava textures to prove that I'm colliding with the lava.
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Illidicia
migrated
Thank you for your report! This issue was, however, submitted at an earlier time as MCPE-6965. You may add any information you find relevant in the comment section there.