User blog comment:Wikification/Concerning page edits/@comment-16533050-20151105072831/@comment-26833018-20151105074523

With visual editor, no. But with classic editor, if you click "publish" after making your edit, it might tell you that it hasn't saved you edit yet and you should click "publish" again. If this happens, don't click publish, instead check the list of categories on the side to see if the categories are still there.