I’ve been getting periodic “no more storage for saves” errors. Now it happened when all I have is one quicksave and two autosaves.

Edit: I found a solution, though I dunno how reliable it is. If you go into Xbox settings, system, storage devices, then clear all local saved games this apparent data leak will disappear, though it will delete all saves on your consoles (saves on the cloud are fine and can be downloaded again). Starfield doesn’t seem to save to the cloud from what I can see, but if you leave Starfield running while you do this your game should still be active and you can make a new save afterwards.