When you shootvan arrow on the ground, wall or anywhere, picking it up again will get you back 2 arrows instead of the original one. This duplication glitch may not happen on all devices. I am playing in I ball Slide tab and i seriously dont like this bug.
I actually dont know how to reproduce it. Just shoot an arrow on thw ground pick it up and you will get another extra arrow
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This issue was reported previously as MCPE-8768; comment your experience there!