Method IsTerrainReadyAt

Is the world ready to have something put at worldPos?

Two things have to be true, and checking only the first is the bug this exists to prevent:

MapMagic generated the tile containing that position and published its layers. The tile object existing is not enough - the data has to be applied.
There is a collider underneath. Not "the heightmap exists" but "something can be landed on": DropAround(Vector3, float) throws items 2.5 m into the air with an upward impulse and lets gravity finish the job, so an item spawned into a tile whose collider is not live yet falls through the world and every later assertion about it reads 0 / null / "should be destroyed".

public static bool IsTerrainReadyAt(Vector3 worldPos)