Kind of the opposite of that. The physical perception is (in all but the rare case) the same but we admit that it stops being actual bread and wine. Instead we know it is the body and blood, soul and divinity of Jesus, that is Christ with us.
Well, if I stopped being an actual person I would definitely not actually be a person. I might be a cadaver, but I would not be a person. It would be verifiable that I actually had ceased to be a person.
So if someone asserts that the cyanide that they just mixed into my drink had now ceased to actually be cyanide I would probably suggest that they drink if for me. If they immediately died as a result I would know that the cyanide had actually remained cyanide. However, if they smacked their lips and had a good night's sleep and woke up in perfect health in the morning I would believe their statement.
Now, shen someone comes to me and tells me in utter sincerity that a piece of bread ceases to be a piece of bread and really and truly becomes an actual piece of human flesh but only when a certain individual performs a prescribed ritual over it that piques my curiosity. However, when the selfsame individual, when questioned, informs me that the piece of bread really and truly retains all of the physical aspects of a piece of bread after the religious ritual, then I find him to be contractory. If, in the present instance, that individual adamantly insists that it really and truly is human flesh, but actually and truly is physical bread, I give him up as either highly deranged or intensely devious.
Add to that, if the same individual comes and declares a miracle when a piece of bread really and truly becomes a piece of human flesh following the same religious ritual, I shrug my shoulders and say, "So what? You told me this happens each and every time that the religious ritual is performed."
So, either it does happen consistently according to the divine formula or it does not. If it does, then God is consistent in keeping His word. If it does not, then He is, at best, unreliably inconsistent.