Villagers working in Cauldrons can be removed by placing Powdered Snow, Water and Lava into a Cauldron

Alright, new bug report.

For some reason you can remove Villagers from working in Cauldrons if there's Water, Powdered Snow or Lava in it. 

 

How to reproduce:

Make a workstation for these villagers (Cauldrons)

Place either Water, Powdered Snow or Lava

Done.