Banner applied to a Shield doesn't change the shield correctly

So I tried giving my shield a custom heraldry, but instead of giving a red shield it would have given me a black one.

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It happens because the crafted Banner has no Base tag in its BlockEntityTag

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• When banners with patterns are crafted with shields, they change their color to black (they are, however, named to the correct color and have the correct Base NBT value).

• When banners without patterns are crafted with shields, they have no change at all.