Material does not render correctly when launched with Cook on the fly

This issue seems to occur when using Cook on the fly on a Material that is branched on the Static switch. This issue also seems to occur on the console.

Regression = Yes, issue is not reproduced //UE4/Release-4.26 at CL 15973114

1. Open the attached project.
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2. Launch with Cook on the fly from Project launcher
Materials using Static swtich are rendered with Grid material.
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Renders correctly when packaged.
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