I have a warped fungus on a stick with Unbreaking III and Mending. I can't cast it. It may potentially be one of the enchantments on the warped fungus on a stick that prevents me from casting it, but I'm not too sure though.
MC-176192
You cannot cast an enchanted warped fungus on a stick.
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Pretty sure this is intended, can't cast a carrot on a stick either