Any cauldron liquid looks like water while being pushed by a piston

When a cauldron filled with a liquid is pushed/pulled by a piston, the liquid appears to be water during the movement. This did not occur in 1.1.0.0 and earlier. Back then, there was a different bug: MCPE-16452, which has now been replaced by this one.

Steps to reproduce:

1. Fill a cauldron with a potion to any level.
2. Push the cauldron using a piston.
3. Notice that the liquid looks like water momentarily while being pushed.