when you activate the shield, it flips upside down
from this, the shield, which has its own texture, is turned over
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migrated
GoldenHelmet
Regardless of device, this issue is already tracked at MCPE-41221.
I'm afraid we cannot help you with issue on Windows Phone. This platform is no longer supported, see https://www.minecraft.net/en-us/article/important-news-regarding-minecraft-mobile