When a skeleton hits an arrow on the player, damage is normally dealt. But when the skeleton misses the arrow and passes close to the player, the arrow disappears and a noise of collected item rings (but no item has been collected). If I'm not mistaken this bug happens when he misses the arrow and it goes near the player. When a skeleton arrow is attached to the ground and the player passes over, the arrow disappears and a noise of collected item touches, but the arrow has not been collected.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-32798.
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