All my worlds that I create, horizontally it is bugged as if it duplicated all the blocks and it becomes an unbearable thing and it was not only in this version that happens already has a good time
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Thank you for your report!
We're actually already tracking this issue at MCPE-31585, 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.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Turn off anti aliasing, see MCPE-31585.