In my superflat world I just made I lost all my buildings due to chunks just vanishing cemetery this also happened in a few other of my super flat worlds. It got rid of the bedrock and everything.
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[Mod] OcelotOnesie
Thank you for your report!
We're tracking this issue in MCPE-140428, so this ticket is being resolved and linked as a duplicate.
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I noticed this happens when choosing superflat or old world types. Everything loads normally, but when you reload the world most chunks you had placed blocks in get completely deleted from existence, while the remaining chunks you placed blocks in are pushed further down into the void so only the top remains. (I assume this is the real issue, but it only appears to happen where there are hills in a chunk in old worlds, since the rest gets pushed below the build limit.)