can't pickup water or lave with split controlls on!

i can't pickup water or lava while split controls are on

What I expected to happen was...:
i thought that i could pickup water while spilt controls ware on.

What actually happened was...:
you simply cant't pick up water you only break the ground under it.

Steps to Reproduce:
1. turn on split controlls in de options menu.
2. get a bucket and go to a water source
3. try to get water, it just won't work

the only way to get water in survival is with split controls off and that not handy. for me.