I found a workaround! Make a standard copy of your latest shared world backup save. Rename the world to something different and then use the option to make it a shared world again. Downside is you lose any previous saves before your latest save, but you're able to continue on a shared world from your latest save. Just did this and it worked. Got my save back and going. Thankfully it autosaved just minutes before I crashed so I didn't lose any progress!