Pipes upgraded from normal to insulated from pre-jobs save cools and deletes liquid in that pipe

It gets deleted you say? Where is that liquid on the floor coming from then?
 

I'm having the same issue, but with a colony I created a couple days ago, on build 253600.  Had it occur several times, but only on insulated pipes.  Temperature of liquid in one segment of pipe slowly drops until it freezes and breaks the pipe.  Temperature of gasses/buildings around it seem to have no effect.  I'll attach my save file, but you probably won't see anything right away, as a save/reload seems to fix the problem.

Video here

The Contagious Committee.sav