Can not place bucket of water in water source block

Put the summary of the bug you're having here

What I expected to happen was...: Bucket would be emptied
Describe what you thought should happen here

What actually happened was...: Nothing other than sound effect
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ... Try place a bucket of water in a water source block
3. ...