It works like that in Java edition too (don't know about console) but the developers said it was unintended behavior
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is duplicated by 4
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However, this issue has been closed as Working as Intended.
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MCPE-22724 needs to have the closure reason changed from could not reproduce to works as intended.
See also MCPE-22724 that was closed as cannot reproduce.. I will add the picture that shows that with potion of invisibility you will still get slaughtered by a guardian. Third person view to prove there was no armour or anything in the hands. MCPE-22724 should have the status changed as duplicate of this one not cannot be reproduced.