Buckets will not work in Split-Touch Controls

Put the summary of the bug you're having here:
Buckets will not work in split touch controls, but will with regular controls
*What I expected to happen was...: Buckets would be able to pick up and water and lava, and also be able to gather milk in split touch mode.
Describe what you thought should happen here:
Buckets should pick up and place water and lava in split touch mode.

*What actually happened was...:
A bucket will not pick up water/lava.

Steps to Reproduce:
1. Grab three empty buckets in Survival mode. (for water/lava/milk)
2. Try to fill one bucket with water, one with lava, one with milk.
3. Empty buckets won't collect anything, while filled buckets can place.