Huge mushrooms can't be grown using bonemeal (Beta 18.104.22.168 Win 10).
Steps to reproduce:
1 Create a flat world
2 Place down a block of Podzol or Mycelium
3 Place a brown or a red mushroom ontop of the Podzol or Mycelium
4 Apply bonemeal numerous times
5 Observe the mushroom to never grow into a huge mushroom
What i expected to happen:
The mushroom to grow into a huge mushroom when applying bonemeal, as it is working in 22.214.171.124.