Whole blocks disappeared. And whatever was on them disappeared. Would you be able to turn back the saves like 3 days please?
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If you have a copy of the world available, you might like to upload a copy of it for investigation.
On Windows 10 you can use the Export world feature.
On Android or iOS you need to use a file explorer to navigate to Device storage > games > com.mojang > minecraftWorlds
On Xbox or Switch the only way is to upload it to a Realm, and then download the world on Windows 10 or Android/iOS. (Please do not purchase a Realms subscription just to provide a world to us - but if you have a Realm already this may be a viable option if you wish to do so.)
If the world is larger than 10MB you can upload the world to OneDrive or a similar file sharing site, and then share the link.
Thank you for your report!
We're actually already tracking this issue at MCPE-58514, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
Again, if you have a copy of the world you can provide that would be useful.
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the link to download the world isΒ https://1drv.ms/u/s!AmPkgSGk74Zxk3pHVDeK02sTqeMQ?e=DPlwZc