When copying a big structure, the outline of a structure block becomes to lapping within the blocks. It depends on how big the structure has to be in order to see this issue.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Same problem here