04/2020 and i have a similar problem. Except i can actualy make a good save if i keep alternating quick save for survival mod and the save as autosave from survival options mod,same for sleeping. Basicaly i have to insist to save and win by making the bug bored of preventing it. I noticed the game alternates every save attempt on making a save file with .f4se and .fos extentions, the only files the games is able to load are the ones with .FOS extention, these are 14Mb files or so, the .f4se ones are 13k more or less.