Проблема с Ray traced reflection В UnrelEngine 5.3
 
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While I understand the advantages of Lumen, particularly for organic environments, it does not yet meet the high standards required for the precise, clean reflections necessary in luxury product visualization. In recent DevTalks, it’s been explained that Lumen uses a Signed Distance Field to simplify environmental representation for faster calculations. This approach, while efficient, cannot replicate the exacting detail and quality provided by Raytracing. We’re deprecating standalone ray tracing features - Ray Traced Reflections, Ray Traced GI etc.

Проще говоря, это никогда не работало нормально и не будет работать никогда, потому что standalone ray tracing помечен устаревшим. Юзай другие настройки.

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