This is a parity issue.
In Java Edition, zombies converted to drowned are never equipped with new items.
MC-130237
In Bedrock Edition, Zombies converted to drowned are
1% equipped with a fishing rod in the main hand.
8% equipped with a nautilus shell in the offhand
Any equipment the zombie had before conversion is dropped.
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We're tracking this issue in MCPE-127343, so this ticket is being resolved and linked as a duplicate.
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