Buckets

With split touch controls you can not pick up water/lava(also on creative)
What I expected to happen was...:

You should be able to pick up water and lava with buckets
What actually happened was...:
Describe what happened here
You could not pick it up while split touch controls on
Steps to Reproduce:
1. Turn on split touch controls
2. Choose buckets from your inventory
3. Try to get water