Not Drowning Bug

Hi, Mojang

I'm one of your beta testers and suddenly when I'am playing Minecraft finding bugs for beta 1.5.0.7 MCPE I found a bug the bug I found is something to do with boats and bubble columns to do the bug you need to have a boat and ride it to a magma bubble column and stay when the boat sinked you noticed that you are not drowning 

that is only the bug that I found 

Thank you.

 

PS.

Don't move when the boat is sinking and I played it with 

Fancy Bubble Columns

On, also sometimes it may not work.