Very inconsistent element temperatures

[DyingCrow]

During a sandbox test save, yesterday, i observed that, sometimes, gas temperatures within a radiant pipe made of wolframite were completely out of context. This was happening inside an electrolyzer box with a temperature of -20ish c on the inside, where the gases being pumped to the radiant pipes were at very negative temperatures, and along the way inside the box, they would sometimes change temperatures from the very cold to the hot or very hot right in the next pipe tile, all in a very cold environment and inside a very cold pipe. So i was getting oxygen packets of some 150c mixed with packets of -20c. I had to reload and rebuild the pipes several times until the issue was eventually corrected, and im afraid i didnt take any screenshots of that :/ think ive gotten used to bugs being way more common inside debug or sandbox, compared to a regular run, so i didnt think much of it at the time.

During a regular run, today, i spotted this

The temperature on the next picture is on the next pipe tile to the right

And this next one on the other pipe tile to the right

The other hydrogen temperatures on the same pipe, going backwards, vary between 20ish to 50ish. All the hydrogen came from 2 adjacent and merged pockets, with similar average temperatures in the low 40ish, so that looks about normal.

Just a few seconds before, i had gotten a scalding warning from a dupe just nearby, going up the stairs, and when i paused to check on it, there was a wild gas packet at some 170ish c (which i didnt think of taking a screen of...then later couldnt find it). There is nothing nearby that could output or heat gas to such temperature. Makes me think of the old, anomalous lava hot pipe bug. But outside a pipe.

Here is a wider view of the area. For a moment i thought the temperature anomaly could have been caused by the nearby gas geyser, but that wouldnt make any sense. The geyser has been dormant since i found it, and the gas around it was at some 30ish c. The affected gas is hydrogen, not natural gas, and the 2 have never been in contact in any way.  

This looks like an obvious bug. The reason why im posting it here is not as a bug report, however, as im just catching up after some weeks not having played the game, and dont know about all the weirdness going around, but just a way to ask if this is a known issue (which i assume it is since its quite easy to spot), and if there are certain conditions under which they happen, or if its just random.

 

 

[Coolthulhu]

I'm pretty sure I've had it happen too - my radiant hydrogen pipe burst due to low temperature despite only exchanging heat with something warmer than it. The pipe was in a natgas cooler, in temperatures low enough to liquefy natgas.

I'd expect it to happen on state change of surrounding medium. Something like:

1. Outside medium changes phase to liquid
2. Temperature of the tile becomes absolute 0 for this tick (I think that's how it works, judging from AETN shutting down due to "too cold" on tick with phase change)
3. Radiant pipe exchanges temperature with this absolute 0 tile because it doesn't fully count as vacuum
4. Radiant pipe temperature drops hard
5. Hydrogen in pipe exchanges temperature with pipe, freezes instantly

The bug probably doesn't depend on radiant pipes, they should only make it more likely to trigger due to higher exchange rates.