The vertex color becomes red when importing a static mesh without Color Set

It seemed to be white at 4.19, but it seems to be red at 4.20.
I found out that there seems to be a cause for initialization of Mesh Attributes.
As a result of fixing this, it is now displayed in white.

.\release-4.20\Engine\Source\Runtime\Engine\Private\StaticMesh.cpp
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1. Import Static Mesh without Color Set
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2. Set Material to display Vertex Color
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3. It is displayed in red
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