When the sword is held, part of the handle is not visible/seethrough. When said netherite sword has any enchantment, the texture overlaps the missing part and a little bit more.
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Thank you for your report!
We're actually already tracking this issue in MC-170819, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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