Can't reveal any tiles in the escritoire for ET saplings

I can't seem to use anything in the escritoire while researching an extra trees sapling to reveal tiles. I can discover extra trees mutations if the base tree is a normal forestry tree. I've tried random saplings, matching saplings, or even matching fruit for fruit trees and none worked. I'm playing the FTB 1.5.2 beta 0.8 pack (with binniemods instead of extra bees)