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I noticed this when fiddling around on one of my questions. Steps to reproduce:

  1. Go to a question (this one), and use the T (10k only) shortcut to open the tag editor.
  2. Add any tag (although the one is preferred), click "Save Edits", let it give you the error, then cancel it.
  3. Watch your hat fall off!

enter image description here

I also did this on this post, and accidentally pulled Anita's hairdo off. With apologies to Anita, can we fix that?

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