I used 1.21.30 because it is for all versions before and this one.
You cannot use fireworks in offhand in bedrock. in java you can, but its pointless in java.
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duplicates 1
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We're tracking this issue in MCPE-49356, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as invalid. Please take a look at the parent ticket (MCPE-49356) and see if an explanation is provided there in the description of the ticket or in the comments for why this issue is invalid.
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Duplicate of MCPE-49356, This was resolved as invalid for Parity issue.