Mobs Spawn in tree's leave.

Device: Samsung Galaxy S6
I have noticed in 0.12.1 Beta 9 and 10 that sometimes Mobs will spawn inside tree leaves if they are one block above the ground. Mainly I see them on Spruce trees in a Spruce Biome, but I don't know if it affects earlier versions. I do not have a screenshot, but if it happens again, I will add one.