Might be a feature (as small mushrooms can grow there anyway), but the real problem is that it allows mob's to spawn on them above the nether roof. Could add a check if a fungi could be placed before the tree is placed as neither of the new fungi can be placed on nether roof?
Might be a feature (as small mushrooms can grow there anyway), but the real problem is that it allows mob's to spawn on them above the nether roof. Could add a check if a fungi could be placed before the tree is placed as neither of the new fungi can be placed on nether roof?