There is an odd visual defect

International 简体中文 (Simplified Chinese)
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1

There is an odd visual defect when viewing the static mesh
We can see a noticeable distortion or black spot within the mesh. This is only visible within the the level, not the mesh editor

Calligraphy and Painting Museum Visual Defect
Calligraphy and Painting Museum Visual Defect1153×571 73.3 KB

2

Are you using static lighting? Maybe increase the lightmap size for the background cubes.