In the 2nd experimental snapshot of 1.18, I made a data-pack where you start on somewhere with some structures with and other stuff that I made. But when I tried to play through a world with this data-pack, it failed to validate. This didn't happen with my other data-packs, it used things that I knew worked, I checked it and it was fine. All I have was this "impossible" criteria that I never used before, this criteria was used with the Vanilla data-pack for the recipe advancements root.

This data-pack uses the seed: 12121212

Also, the seed makes you start in the middle of an ocean which doesn't make any sense.