Well, can't wait for the next update. Hopefully this time it won't break save compatibility
I put a lot of work into preserving saves every version. If you've returned and your save is just gone, it's likely due to the browser clearing its data - as with all browser games, it's recommended to keep an exported copy of your save, especially if you're not going to be playing for a while. If you have an exported save and it failed to load, that's a bug. If you send the save on the discord server, I may be able to recover it.