In SP its easier yes, but what bout MP??
Yeah, I can confirm that your fix works. It's how I fix it, by splitting the bugged fleet, moving the admiral, then merging them: New fleet, new fleet queue, the ghost ships are gone and you can fix the template.You don't need to do this. Just transfer all ships to a new fleet and delete the old fleet.
It sucks, but once you know about the workaround, this bug isn't gamebreaking by any measure.
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