Witch hut failed to generate

Witch hut can not generate in 1.13 snapshots/prereleases.

Seed: 5178019746038571832

Coords: /tp @s 1779 69 -3979

In 1.12 you've been teleported on top of witch hut. In 1.13 there's no witchhut nearby. Structures as far as i know should stay close to old locations, just with different variants, like villages.

This bug might be related to MC-131436 and MC-131462

Side note: Ocean monument appeared at 1700 70 -3850 which didn't exist in 1.12.