Hello there @EN6A6E!
From your provided screenshots, this looks like a reflection conflict, which should be corrected by a post process adjust, as seen in the technical documentation for Lumen:
Problem: Small Meshes are Black in Mirror Reflections
Small meshes appear black in mirror reflections because Lumen culls small objects from Lumen Scene for performance. In the Post Process Setting, Increase the Lumen Scene Detail will capture smaller meshes over farther distances.
If that adjustment does not fix the problem, then we could be facing a software conflict. Let’s try some methods for resolution:
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Please update your OS to the latest version, and your nVIDIA drivers, make sure you are picking the “Clean Installation” option, as well as going for the “Developer” drivers, as these have more stable settings for engine work.
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To rule out hardware issues, in Unreal Engine, adjust your values for engine scalabillty, to ensure your equipment is not being exerted.
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Test disabling Hardware Raytracing from the engine
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Please make sure that no RTSS or overlocking are enabled for your video card while working on the engine.
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Uncheck all SM5 in the project settings (Project Settings → Platforms → Windows).
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Disable motion blur in postprocessing settings.
