I was playing with the 1.18 pre-snapshot version and I started noticing some generation bugs. First, the ocean ruins (I know that they can spawn on ground but not so far away from the ocean) and then I found some very rare but super tiny biomes generating right next to each other (I have never seen biomes so small) I have added screenshots and the seed for that world is 1209116578767856944. I hope this is useful .