Bonus chest may be replaced with leaves if the player spawns in a jungle

Expected behavior: bonus chest should spawn on top of any leaves that are in the space it wants to spawn in.

Observed behavior: bonus chest will try to spawn on the ground anyway, and will not appear because the space is already occupied.

To reproduce: create a new world with the bonus chest enabled and a seed (such as SANDY) that spawns the player in a jungle, and try to find the chest.