In FontCreator 11.5.2427, 64-bit:
Entering the text SUPERSCRIPT FOUR into the “Find by Character (Name)” box and clicking “Find Next” fails to find the character $2074.
If you click on character $2074, the “Selected Character” shows as “$2074 - SUPERSCRIPT FOUR”, which should match, and SUPERSCRIPT FOUR can be found in a text search of the UnicodeData.txt file. I haven’t found any other character where the search fails like this.