I was on my 8+ year old world today and I suddenly get booted to an error screen on a dirt background saying "You are out of data storage space and Minecraft is unable to save your progress! Minecraft will return you to the main menu to clear up storage space".
I'm playing on Xbox Series X and have 1.4TB of storage remaining so I have no shortage of space and now I cannot access my oldest world. Really frustrating bug especially since this is my oldest remaining world, please help.
Since you asked for help, you might want to visit Community Support. We are not generally able to provide direct technical support via the bug tracker.