Unlike MCPC, whenever you get into water when you're flying, the game makes you stop flying.
MCPE-9434
Getting inside water when flying makes you stop flying
Resolved
Fixed
0
(Unassigned)
Unconfirmed
Phone - Android - LG Nexus 5
Android 4.4.4
0.12.1 Beta 2
0.12.1
Retrieved
I believe that is SUPPOSED to happen...