Farmland sometimes instantly breaks upon harvesting the crop growing on it

Put the summary of the bug you're having here

What I expected to happen was...:
Break only the crops instantly, farmland requiring the normal delay to break

What actually happened was...:
Farmland breaks instantly upon harvesting crops.

Steps to Reproduce:
1. Plant crops on farmland
2. Break planted seeds or wait for them to grow
3. Farmland breaks instantly as well