Sheep regaining wool without eating gras

Put the summary of the bug you're having here

What I expected to happen was...:
Sheep should have eaten grass. Changes grass block status to be observed and auto sheared.

What actually happened was...:
Sheep got wool back but grass stayed

Steps to Reproduce:
1. In a snowy tundra
2. Sheared sheep
3. Sheep regained wool without grass leaving