There are control codes in that text, probably there as a result of an incorrect conversion from some other encoding to UTF-8 at some time in the past. In this case the character is
https://www.fileformat.info/info/uni...0097/index.htm
This is not a renderable character, which is why it does not show up in the editor. IIRC whether it renders in the preview or not depends on the properties of the font being used there, whether it define s a glyph for this codepoint or not.