Ocean ruins and sunken ships world blend issue

Would you mind attaching the 1.17 copy of the world to investigate?

That world was generated in Minecraft 1.6.4 and is about 650MB

Here is a much smaller world created with Minecraft 1.17.1.

I then updated it to 1.18pre5 and found an ocean ruin here:

Thank you for your report!
We're tracking this issue as MC-239865, 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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