I'm not sure if people encounter the save issue without modding the game, however, I do get it most of the times and I play only with mods. If it is important to recreate it no matter if the game is modded or not:One of the main things I’m looking for in the save corruption thing, is any browser console errors that may occur for you when the save corruption happens (it would happen during saving rather than during loading which is the tough part, because you wouldn’t yet know it’s corrupt). So far I have not been able to reproduce the issue myself, as soon as I have a way to reproduce it I’ll be able to fix it… hopefully!!
I had played for few days with some mods. Today I decided to add a few more mods that are up to date and supported and continue from the same save. Upon saving after just 1 day with the new mods, my save got corrupted. Once I removed the newly added mods, I no longer got a corrupted save upon saving. If you are interested in recreating this, let me know, I will send you my save, the mods that were loaded during the playthrough and the mods that I added in order to get a corrupted save.