Alright so after spending most of today uninstalling and reinstalling mods to find the wtf was making the saves crash, I found out the culprit, Fallout VI Gore Overhaul. I wasn't even using the plugin, using the textures is enough to make the game crash with the beta patch, other people in the mod comments were having the same issue as well. Keep in mind there might be other mods that cause this same issue too, hope this helps.