fossils in the soul sand valley biome generate above each other . i don't know why but it wont let me attach a screenshot reddit.com/r/Minecraft/comments/ezoqm1/strange_fossil_generation_in_the_nether/
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Thank you for your report!
We're actually already tracking this issue in MC-170815, so I resolved and linked this ticket as a duplicate.
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I can confirm that exact structure on the right happened to me too. Very strange.