The save file is no longer usable after over 100 hours of playtime. I’ll probably uninstall the game and wait for the full release. As I progress through the game, the bugs keep multiplying and there are no solutions. But new content that will probably bring a lot of problems along with it. Too bad 
Don’t panic: this is a known bug with custom furniture. All you have to do to fix it is place a section of wall or similar over the bed to delete it, then press the ‘undo’ button and the bed should be useable again. Annoying, but not game-breaking.