The bug
When trying to locate a pillager outpost using /locate Pillager_Outpost
on a superflat world that also includes {{pillager_outpost}} in the superflat preset, the game will completely freeze.
How to reproduce
Make a superflat world with the following preset:
minecraft:bedrock,2*minecraft:dirt,minecraft:grass_block;minecraft:plains;village,pillager_outpost
Try to locate a pillager outpost.
/locate Pillager_Outpost
→ ❌ Game completely freezes, although FPS doesn't drop whatsoever
Linked issues
Comments

I seem to be getting similar results from doing the same thing with the new villages (New_Village). Description should be changed accordingly. This also means it affects 18w48a.