Sprinting while in water or lava enables flying in Creative mode

If you are in Creative, and you are floating, swimming and sunk to the bottom in water or lava, and then double-tap forward (for sprinting), flying will automatically be activated (and you will be sprinting).

I expected flying would not be activated.

Confirmed on:
Samsung Galaxy S4 Phone Android 5.0.1
Samsung Galaxy S3 (GT-I9100) Android 5.1.1
Samsung Galaxy Note3 with Android 5.0
Samsung Galaxy Tab 3 with android 4.4.2