Ruined it too.
I was about to play EP5, and was finishing EP4 for the second time for fun with some particular decisions when all saves were lost.
As there is still no way to generate manually the choices initially made, except redoing all the game, I still haven't played the EP5 and I'm hesitating to keep on playing... I hope that somewhere somebody could hear us, and built a smart solution, even just to simulate the choices (not random anyway).
Of course, if the story keeps on for an other season, we could only hope that these unacceptable bugs will be fixed.