Dark Wood Oak Saplings don't grow using bonemeal many time.
What I expected to happen was...:
I thought it would eventually grow.
What actually happened was...:
It wouldn't grow when I attempted it.
Steps to Reproduce:
1. Place Dark Oak Sapling down.
2. Use bonemeal it repeatedly.
3. Doesn't ever grow.
You need a 2x2 of saplings for the Roofed Oaks to grow :/ Bonemeal one and all 4 grow.