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Were the corrupted file previews an F8-style command block and a few purplish squares all jammed into one another?
I've seen this sort of thing happen before, it usually occurs when the mod is uninstalled or missing, or when the game can't read the mod's blocks.lua, or when the file offset assigned by Steam Workshop changes for whichever reason. Basically, the game tries looking for each of the blocks to render that save's flagship, finds nothing, and instead uses block ID 0
I've never heard of a mod killing a different mod's blocks though - didn't thin it was possible. I'll have a look at replicating that bug over the next couple days. In the meantime, if anyone else has this trouble, can they please shout out?
What happened? What was the faction that clashed with this one? And what do you mean by ruined?
@Conga
Technically it's a cannon block...