My worlds no longer sync or save to the cloud since this last update. I even went so far as to re-set my Xbox One X but still won't sync or save to cloud. I started a new world and will not save to cloud either. Naturally I checked my connections, Internet, etc. 

The new world does save locally, so I guess there's that and I am able to load the old world. However, when I quit and it saves it does tell me unable to save to the cloud.

BUT - though my old worlds are listed I cannot even play them because they are unable to sync at all. This is nuts.