Buckets can't pick up stuff but milk

Put the summary of the bug you're having here
I can't pick up water with my bucket.
What I expected to happen was...:
Describe what you thought should happen here
It should have picked up the water.
What actually happened was...:
Describe what happened here
My bucket wasn't filled with water.
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...get a bucket.
3. ... Find water
4. ... Hold down on water with an empty bucket and you can't get any water in the bucket