Piston and Caudron Crash

I know pistons and sticky pistons are supposed to be able to push and pull filled cauldrons without removing what's in them. The problem is, doing so crashes MCPE. Occasionally, reloading the world after the crash will allow you to do it, but it has to be the first thing you do after the reload. The crash also empties the caudron of whatever was in it prior to crashing.