i found this on 1.17 i dont know if its on others but if your in the nether and have your shield up and go to the overworld and let go of the shield while loading into the world the game will think you still have it up so it blocks attacks and you can attack at the same time.
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We're tracking this issue in MC-86252, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MC-86252.