Fireworks don't explode upon impact, essentially rendering them useless and pointless as weapons. Because they won't explode, fireworks will go through an entity or "glide" along a block, to which it would explode later. This makes the crossbow a very ineffective weapon compared to it's Java counterpart.
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We're tracking this issue in MCPE-52675, so this ticket is being resolved and linked as a duplicate.
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Duplicates MCPE-52675