I'm having some kind of problem with saving certain maps with scripts, including this one.

Half of the saves become corrupted after a certain stage - none of them load, and the game crashes when the heroes are loaded. I managed to load a relatively recent save (3-4 game days). Saves from other maps load as usual. What could be causing this? (I have a feeling that something is getting messed up in the game, which causes the map to be saved incorrectly - I reached the glitched point again, and the saves are working normally for now. I've only experienced these glitches on 2 maps)