Currently in minecraft bedrock, if you have a shield that was used and has lowered durability, adding a banner can reset the durability to full. This behaviour was discovered on bedrock dedicated server and more.
I added a shield and an ominous banner, this for some reason maxed out the durability of the shield.
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We're tracking this issue in MCPE-174268, so this ticket is being resolved and linked as a duplicate.
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