If you remove the v1.3 update, would you revert to 1.2.1?
I think you've made it more complicated than it should be.
If 1.2.1 was the issue, then should have worked to resolve the issue on that.
Also, I doubt it's the saving injecting and exporting, since every save is the issue.
Tho, to be sure, the save name is main, and not anything else right?