Stuff gets deleted after a while!
Basically, when I went Into a world to make an adventure map, it was all fine,I was building, until it crashed… fortunately not everything was taken away and I rebuilt what I was suppose too, until I had to go to school. And when I came back, well, it was EVEN WORSE!!! Please fix this cause it’s hard to make underwater maps with only sponges as your go-to water remover. (The Image here is how it looked when I came back ((that entire part was filled in)) 
Environment
PE & Bedrock edition
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Changed description:
Basically, when I went Into a world to make an adventure map, it was all fine,8 was building, until it crashed… fortunately not everything was taken away and I rebuilt what I was suppose too, until I had to go to school. And when I came back, well, it was EVEN WORSE!!! Please fix this cause it’s hard to make underwater maps with only sponges as your go to water remover. (The Image here is how it looked when I came back ((that entire part was filled in)) 
Basically, when I went Into a world to make an adventure map, it was all fine,8 was building, until it crashed… fortunately not everything was taken away and I rebuilt what I was suppose too, until I had to go to school. And when I came back, well, it was EVEN WORSE!!! Please fix this cause it’s hard to make underwater maps with only sponges as your go to water remover. (The Image here is how it looked when I came back ((that entire part was filled in)) 
Changed description:
Basically, when I went Into a world to make an adventure map, it was all fine,
Basically, when I went Into a world to make an adventure map, it was all fine,
Changed description:
Basically, when I went Into a world to make an adventure map, it was all fine,I was building, until it crashed… fortunately not everything was taken away and I rebuilt what I was suppose too, until I had to go to school. And when I came back, well, it was EVEN WORSE!!! Please fix this cause it’s hard to make underwater maps with only sponges as your go
Basically, when I went Into a world to make an adventure map, it was all fine,I was building, until it crashed… fortunately not everything was taken away and I rebuilt what I was suppose too, until I had to go to school. And when I came back, well, it was EVEN WORSE!!! Please fix this cause it’s hard to make underwater maps with only sponges as your go
Resolution: Unresolved → Awaiting Response
Resolution: Awaiting Response → Unresolved
Resolution: Unresolved → Incomplete
isn't happening to me and I have like 3000 days in my world
Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response
Is this only happening on a Dedicated Server, realms, multiplayer or singleplayer? What plaform are you using?
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki