[5.7] Why doesn't Mesh Distance Field work on materials?

Development Asset Creation
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I have the following scenario:

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image1331×830 221 KB

The floor/plan has a material with the following graphic:

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image1843×1205 506 KB

I’ve watched many tutorials on Distance Fields in Unreal, and I’ve read the official Distance Fields page for Unreal version 5.7. I have “Generate Mesh Distance Fields” enabled. All the tutorials do the same thing, and it works. I’ve also tried doing it without the 1-x node and reducing the distance parameter. Why isn’t the cube drawing the plane?