If the item can't be picked up there is an error in it preventing it from being treated like a real item. If you did not set the Count to at least 1 then its a stack of 0, which is a bit of an issue as whens the last time you had a stack of 0 in your inventory?
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Server: Bunny Burrow ----------- Currently not accepting new players
24/7 Survival server running custom made command block enhancements.