when you go into third person mode (pressing F5 twice) in a box of tinted glass you can see yourself also if you hold an item and press F1 you still see yourself but if you are not holding an item you disappear but only if looking through the tinted glass.
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We're tracking this issue in MC-168137, so this ticket is being resolved and linked as a duplicate.
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unable to replicate, please add images or a video.