Hi, happens all the time when we modify the save files with Mods, sadly.

Just follow the steps we all do after a game update to find the mods that needs to be removed and reported, but keep in mind removing a Mod can break the save file at a point of no return and can give a popup message saying the world is corrupted.

How to test a world or find broken/conflicting Mods :

1 - Select your save.
2 - Click the "Save as" button on the left.
3 - Change the save name to create a *copy.
4 - Withdraw or add one Mod at a time in the copy.

5 - Report to the Mod author (on WS item page) when broken Mod found so he can fix/update his Mod to the new game version, always very kind to let them know.

*copy
Never test with your original save, better create a copy and fix the original save when solution found in the copy, this way you will not mess up your save.

Ref.:
Forum/Community workaround(s) Pin 📌
https://steamhost.cn/steamcommunity_com/app/244850/discussions/6/3464975177698306889/


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Caution when removing Mods :

-> Some Mods delete and replace important code lines in the save files that are not added back in when remoiving the Mod, that can break the save file at a point of losing the save.

I will add :

You may start by doing the important in Forum/Community workaround(s) Pin 📌link I have shared, try #1 + #2 + #3 to see if that can help.

+
Remove Plugin Loader, for a test, if you use :

How to remove Launch Options
Open your Steam Library

1 - Right click Space Engineers and select Properties.

2 - On the General tab you'll find Launch Options section.

3 - Remove the launch options, delete all in that text box.

4 - Close the game's Properties window and launch the game.