Okay, first of all thanks for letting me know. And don't worry, your English is perfectly reasonable!

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?

Victorians From Moon lord And The meat faction from dimkajar. You lose every blueprints-Modules ect and your faction seem to turn hostile at you. i Didn't tried with other mods ( The saves get "Wiped" only if you load them...Well i think because nothing happened to the meat faction. Except the save icon had the same visual bug as the victorians so i guess it was the same result if i loaded it ) The story is a bit my fault. I should have been more cautious when i seen my modded factions saves icons bugged. Oh just in case. Sorry for my english ;p

@Abysse
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...

Well seem like the file is lost. Good new = only the faction ( the modded one ) that i tried to play with bugged. And i still have my best ship design saved on my dekstop so it's "fine". Once this bug is fixed i'll try this faction asap anyway ;p

I don't know where to start. i'll just warn others = This mob ruined some of the modded faction saves i had. Needless to tell how much i'm p*** off. if you know a fix to that ( I higly doubt ) it's welcome.

wtf is that command shape