fossil generated in the last layer of the world

It all starts when I was playing in my creative world and I fall into the void, and I see that in certain coordinates instead of having bedrock there are blocks that have nothing to do with it, I get closer and it is a fossil placed in such a way that if we dig down,It all starts when I was playing in my creative world and I fall into the void, and I see that in certain coordinates instead of having bedrock there are blocks that have nothing to do with it, I get closer and it is a fossil placed in such a way that if we dig down.
Seed:4530390425317332585 coordinates-88 -67 327