I was just fooling around it in survival mode when I place a sticky piston behind a cauldron with water or potion, when I activated the piston the game crashed.
Crashes happen in both survival and creative modes.
Steps to reproduce
First of all make sure you're testing this in creative.
Place down piston.
Place cauldron in front of piston.
Fill cauldron with water or potion.
Place redstone dust and add a lever to power it. (See photo attached.)
The game WILL crash.
Linked issues
is duplicated by 15
Attachments
Comments 18
Confirmed on my Samsung Galaxy Tab 4. 0.15.0 build 1.
If it doesn't crash the first time, it will crash the second time.
Steps to reproduce
First of all make sure you're testing this in creative.
Place down piston.
Place cauldron in front of piston.
Fill cauldron with water.
Place a redstone torch behind the piston.
The game will crash.
Also crashes if you partially fill with water or a potion.

Cannot reproduce in Windows 10 Edition 0.15.0. Possibly fixed?
Updated description with what I did, game still crashes.

Confirmed for 0.15.6. (Tested on Windows 10.) A good way to reproduce the bug is to setup a fast redstone clock to rapidly pull and push a cauldron with a sticky piston. Also, what The Bosshead said is also happening for me. Once the cauldron starts causing crashes, it will do it every time you try to power it again when you reenter the world.

Confirmed for 0.15.90.2. (Tested on Pocket Edition.)

Affects 0.16.0 beta build 4 AKA 0.15.90.7.

Affects 0.15.10. (Tested on Windows 10.)
Fixed in 0.15.90.8
Cannot Confirm on Samsung Galaxy Note 5. Android 6.0.1 Version: 0.15.0 Beta Build 1