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This is unfortunately far from a minimal example, but I attach a crash log and save. I apologize if this is duplicated somewhere. Also this is updated through Steam. Relevant: I was able to load this same save before updating to 17.55 from 17.54, but rolling back to 17.54 and also to 17.52 didn't enable it to be loaded. So perhaps I need a full reinstall? However I have some older saves from this run that can load. I can include those if need be.

Edit: removing Advanced Underground Piping removes the crash, though in this particular save it promptly triggers a different (expected) crash due to a modded circuit network entity referring to a now-nonexistent entity.

Further edit: downgrading Advanced Underground Piping to its previous version also removes the crash, so this is probably the mod's fault. Still leaving this in case it is of interest, since it does trigger a core game crash, not a mod crash.

Thanks for the report however the log file doesn't show any crash. Maybe you uploaded the wrong log file?

My bad, I guess I did upload the wrong file. I don't have the exact save above anymore (I overwrote it after finding the workaround). I updated the mod to trigger the crash again and then attached another save and log that actually shows the crash. (This time I double checked...)

The mod changes probably fix it because it triggers migration and that fixes a lot of stuff.

Staplergun figured it out, he had a bug that caused some of his modded pipes to get rotated during migration. Presumably in my base this caused fluid mixing or something like that. Not your problem.

Ok, good to know.
We generally want to avoid crashes anyway, but since the crash is actually a failed consistency check and it found a mod bug, i think it's good to leave as is.