Hello, I am not convinced that my ticket is a duplicate, the https://bugs.mojang.com/browse/MCPE-42310 speaks about different case.
I think this one is related: https://bugs.mojang.com/browse/MCPE-42866
Thank you, can you give more details please and explain how a broken rendering of underwater areas is duplicated by a piston texture issue?
Exactly, this 1.9 update is quite harmful for the game. I have reported one more issue yesterday - https://bugs.mojang.com/browse/MCPE-42866
MCPE-42866