I was traveling around my world in Minecraft pocket edition and around eight million blocks or so I fell through the world into the void. This can happen in survival and creative mode if you are flying, as far as I know this only happens with IOS but I am not sure.
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Thank you for your report!
We're actually already tracking this issue at MCPE-11418, so I will resolve and link this ticket as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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1) This glitch is well known, do some research before reporting
2) There is absolutely no reason why you would need to travel 8 000 000 blocks in one direction, so this isn't that important.