Acacia and dark oak Leaf Decay is nonexistent

Leaf decay does not occur. (Saplings still appear when manually breaking leaves, however). Tested on Acacia trees, will test on other trees and report back.

Edit: It appears that leaf decay works on trees added before 0.9.0 (Oak, birch, spurce, and jungle), but not on the 2 new tree types (Acacia and dark oak)