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When you're looking at a question that has a "migrated from..." banner (like this one), and then somebody edits a post, spawns one of those yellow boxes that prompt you to click to reload that post, and you click on that box, the "migrated from..." banner vanishes.

This bug appears to have been fixed for other types of banners (see here).

marked as duplicate by Shadow The Curly Braced Wizard, Martijn Pieters, Azik, Danubian Sailor, Lance Roberts May 27 '14 at 13:23

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