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Log (sanitised) is attached. I'm not really expecting much here because I didn't save the game and thus have no reproduction steps.

The context is entirely vanilla in the midst of a 100% speedrun that was dead (unrelated to this issue, though I guess it would have been eventually to this! ).

I wasn't even interacting with the game as I was drinking some water while construction bots were building a nuclear power plant that I expect was warming up.

The goal if this bug report is to put it on the radar that whatever is causing this is still doing it.

Thanks for the report however log file only for this bug report is not enough. Looking into the code the only reasonable way for such failure is for the heat buffer (heat pipe, reactor, heat exchanger) to fail its update if it is considered to be already updated in this tick. That could happen due to memory corruption or because of some flaw in the code, but without a reproduction steps this is not possible to be verified.

Totally understand! I knew it'd end up here eventually.