Whenever they are worn, helmets "flow" on the player's face (and enemies') like some sort of mask, then they disappear and flow again in an endless loop. It doesn't have to be triggered: just wearing the helmet makes it appear and disappear in a sliding, vertical way on any entity's face. Such a thing does not happen with any other piece of armor.
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We're tracking this issue in MCPE-174535, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MCPE-174535