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Tested in both the Main Content textarea and the Compatibility Notes field. <code><body></code> is not interpreted. <code><div></code> is and affects the saved page. This appears very similar to bug 19495, except that bug only references Preview Mode.
confirmed, <div> breaks stuff in both those fields maybe the <code> issue and preview bug issue are separate ones
*** This bug has been marked as a duplicate of bug 19495 ***