I reported this issue on the bug tracker.(I'm sorry that my English is not good) And I wrote like this "If a player stand on a stone turf, BFB can land on wrong places". This is not yet fixed. "stone turf" means turfs around pig ruins and ancient statue in jungle. It means that the BFB can land in jungle, although the BFB doesn't usually land in jungle while the player is in jungle. I thought that is wrong, but is this intended?
BFB can land on wrong places if a player stands at spots such as a stone turf (which turn to a turf of Deep rain forest by being dug up) and edges of the world in Deep rain forest. Moreover, BFB tries to destroy a Crumbling brazier but it is undestroyable.