After I save and quit my survival world, then when I play or load that world again I will spawn in the world spawn instead in place where I leave the world. I spawn in world spawn but in the air causing me to fell down and die and all my stuff were lost.
Thank you for your report!
However, this issue is a Duplicate of MCPE-38374.
If you have additional information, please add it to that report.
You might wish to search before reporting, as it's likely that a bug has been reported previously.
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