The outpost captains and patrol leaders don`t have the banner attached, it just floats behind their head.
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Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response
Is this still an issue in the latest version?
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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 Cannot Reproduce. 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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The banner I believe is a bug, but the patrol system is working as intended. The reason people think it's rare is that the event happens after 5 in-game days. After that point, you'll be sure that it is well balanced in frequency. (And yes, I waited for 5 in-game days to state this fact.)