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Unable to load my main map after playing around in a different map for a bit. Earlier today I had a Factorio crash while loading the map, then it worked fine again for a while, but now it won't load any more. I have no other autosaves of this map, because the autosave system uses the same filename for autosaves of any map.

Platform: Ubuntu 20.04.

31.084 Loading map /home/paul/factorio/saves/CrescentLake.zip: 71005645 bytes.
31.128 Loading level.dat: 186035442 bytes.
31.136 Info Scenario.cpp:196: Map version 1.1.8-0
32.647 Warning Map.cpp:346: Map loading failed: Corrupt map: unknown entity prototype ID 46934.
32.925 Error AppManagerStates.cpp Corrupt map: unknown entity prototype ID 46934.

Thanks for the report; do you have any way to take a known working save and get it into the broken state?

That error means the map is corrupt; so unless you know how to make it happen I'm likely to think your Pc is having hardware issues and corrupted the save.

Thanks for the quick reply. There are no other stability issues on this PC, and storage is on a ZFS filesystem, so disk corruption seems very unlikely.

I have no idea how to reproduce this, just as I have no idea how this did happen. It was a map with >1300 hours on it, which just went *poof*.

Not using any modes, this is a vanilla install.

The autosave system in Factorio really shouldn't overwrite one map with another like it does.