Unity 5 - random tree rotation doesn't work

I’m trying to place trees using the new tree randomization features in Unity 5. I have “Random Tree Rotation” checked but when I place trees with the brush they are all facing the same direction. I’m using the standard palm tree prefab.

Has anyone tried this feature? Height and width randomizations work but not rotation.

Hi ! I stepped on this just after upgrading to 5.2.
Random tree rotation works fine with LOD-built prefabs.