This has now happened twice to me: a broken down nether portal structure will spawn under water with lava that is completely submerged in water but hasn't become obsidian
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Comments 3
Thank you for your report!
We're tracking this issue as MCPE-7284, 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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Can you provide the seed and coordinates of where this happens?