The shield when blocking is placed incorrectly when looking at it in 3rd person view.
You can remake this by just blocking with a shield and pressing F5
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Duplicate of MC-86127 which was later resolved as "Works As Intended".

Thank you for your report!
We're tracking this issue in MC-86127, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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