When Experimental Gameplay is disabled, it is not possible to place bamboo on top of bamboo saplings. Since all of the other 1.8.0 features are out of Experimental Gameplay, I assume this is not intended.
Steps to Reproduce
- Create a world with Experimental Gameplay disabled.
- Give yourself bamboo.
- Plant the bamboo.
- Try to place bamboo on top of the bamboo sapling.
Bamboo cannot be placed on top of the sapling.
Bamboo can be placed on top of the sapling.