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It happened to me a couple of times and I see it happen to others, too: Only by selecting an entry in the CC list of the Bugzilla task editor, this entry is removed when submitting changes. There is no visual indication that something will be removed. As an improvement, I would suggest to add a Button "Remove selected entries". When clicked, the selected entries are shown as strike-through.
Agreed, the current UI needs improvement. It would great if you added your feedback to bug 152553 where we have collected other suggestions for improvements as well. *** This bug has been marked as a duplicate of bug 152553 ***