I have a very large map with a file size of 2.47gb. Recently whenever I load the map the auto-save icon will come up and if the file size goes past 2.5gb the map will crash with the error "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 currently have over 200gb of space free on my PC and do not believe that I'm too low on space.
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Crashes and related issues such as these are logged automatically, and will be looked into further by the development team - thank you for your patience and understanding while we get these issues resolved.
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Many communities are experiencing this same issue. The host will see an error indicating it is our of space, and players will see an error saying the world is corrupt.
The community seems to be in agreement that it is related to loading new chunks, which is why it happens most often while traveling long distances, like with a boat.
There is already a bug report higher up in the priority list(90 Votes+). You can help draw some attention to our problem by voting for it & adding any additional details you may have. Hopefully by consolidating and raising awareness of the one issue we all will receive a faster resolution.
https://bugs.mojang.com/browse/MCPE-32501