Dispensers consume bonemeal even if there is no crop to grow in front

I noticed in the latest snapshot that when a dispenser with bonemeal in it is triggered, the bonemeal is consumed even if their is not a crop/tree/flower to grow in front of the dispenser.
This is a change from the behavior that has been in place for quite some time.

What did I do:
I had a dispenser with a bonemeal in it, and the dispenser is pointing at a block, which has a fully grown wheat plant on top of it. I click a button to activate the dispenser.

What happened:
The bonemeal was consumed, even though it was not used to grow the wheat (it was already fully grown). The green particle effect is displayed.

What I expected to happen:
The dispenser should have 'clicked' but since the bonemeal was not actually used to grow a crop, the bonemeal should not have been consumed.