Ryan Carstensen

The same thing happened to me, I blended an old world and after that I found a spawner in a dungeon that the game timed to make look like a cave or something. I checked the seed again on a fully 1.18 world instead of a 1.17 converted to 1.18 world, and it was normal on there. So it has to have something to do with blending.

For me it isn’t a realms world, idk anything about realms though. It was also just empty when I found it, and it still is. Likely to blending because the dungeon wasn’t a cube like normal. It looked like the game tried to shape it like a cave inside because the blocks were out of place.