The glitch causes the shield to clip through your head. It obstructs first person view and putting the shield up doesn't do anything. Currently, there is no known way of getting rid of the glitch.
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[Mod] OcelotOnesie
Thank you for your report!
We're tracking this issue in MCPE-118539, so this ticket is being resolved and linked 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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