Being the command guy I am, I was toying with custom heads. However, I couldn't help but notice a black box around the 'cooldown' box and the dual hand box. This only happens when I have a custom head in my inventory somewhere (EXCLUDING my head). Video is attached.
Thanks,
ThePTGuy
(This might be something to do with my OptiFine, if it is, sorry!)
UPDATE: This happens with the player skull in the creative menu, too.
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duplicate of MC-94576, if you have not, please use the search function in the future