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I don't know if this is something that you care about too much, but I decided to test something on my post because I was bored. If I edit one of my tags to be the same as the community tag (which wasn't particularly helpful in this case =/), the tag shows up twice. Meanwhile, when I tried to edit it to use #newtohubski twice, it wouldn't change (which I assume is intended).
I assume you would want to allow the user-made tag edit, but only show the tag once.