If you submerse yourself in lava for a second you can see through it. This can be seen best in lava lakes. (Right when you enter the top layer of the lava)
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Same thing happens with water.
GoldenHelmet
Thank you for your report!
We're tracking this issue as MCPE-6965, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Won't Fix, which means this is considered a bug but won't be fixed. The description of that ticket or the comments might explain the rationale. Please do not leave a comment on the linked ticket.
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I know, it's SO weird!