Using bone meal in the respective biomes doesn't generate bushes

The Bug:

Using bone meal in the respective biomes doesn't generate bushes.

In other words, bushes can never be generated from bone meal.

Steps to Reproduce:

1. Enter a plains biome and obtain some bone meal.

2. Apply bone meal to the ground several times and observe if bushes are ever generated.

Observed Behavior:

Bushes don't generate.

Expected Behavior:

Bushes would generate.