In some situations I cannot really understand, insulated tiles have their temperature change very quickly. For example, from 0 to -150 in under a minute. For now I have only seen it in a cooling area with liquid oxygen. Not all tiles cool at the same time.
Some tiles even get oxygen gas leaking through it. In that situation (hard to reproduce right now), duplicants were able to pass through the tile!
Make a cooling circuit in an area enclosed with insulated tiles.
Cool oxygen down.
Watch the temperature or surrounding tiles.