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This is caused by the inverse-order polgyons after mirroring. Adding a union_ before offset_ex fixes this bug. Github: #1621 Jira: 2738 Change-Id: I885a3ca6af4e5fadb2158d913cf67525bfffa91e (cherry picked from commit 4ea95d89e7ec058ac21218e1839cfe16b486893a)