Somehow this suggested edit cleared out the tags completely. This shouldn't be possible (and I can't reproduce it), but you can clearly see it happened from the image below, and from the revision history.
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I saw this too. Very strange. Couldn't manage to reproduce it though.– ZibbobzDec 20, 2013 at 16:22
1 Answer
As per this question on MSO, there seems to have been an issue with tags on suggested edits that briefly got pushed out today; the code is apparently already fixed so that it won't happen again.