a certain postition in lava makes it so you can see through it like it's only air.
place 2 blocks ontop of eachother in lava (bottom block must be atleast 1 block under surface level), then remove the bottom block, then go under and fly up so your hitbox touches the bottom of the top block. you will then see through lava like it's nothing. it works in survival too.
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We're tracking this issue in MC-3615, so this ticket is being resolved and linked as a duplicate.
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