At the moment of aiming it makes an animation of grabbing an object and then it shoots as it looks a bit transparent when enchanted, another is at the moment of entering the nether with the enchanted bow and therefore it becomes invisible but continues its functionality of shoot arrows, it's still like that with the recent 1.16.221 update.
Mobile = Huawei y9 2019
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Duplicate: MCPE-116880 MCPE-116741