One of the easiest ways to locate strangely hidden Type layers, is to use Free Transform on the Type layer. The handles and bounding box show you where it is and what size it is. Then you can think about whether it is
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In addition to Trevor's excellent list, if the font size selected is too small to adequately display, it will seem invisible. If you Dbl-click on that Text Layer, you should then Select any Text that is there - you can go to the Characters Panel, and change the font size up, to display (if that is the issue).