I’m starting to understand where this bug came from. I was getting the problem mainly in scenes that were converted directly from the previous version of Unreal. These scenes often contained elements from other scenes with the “Distance Field Indirect Shadow” option enabled, which is why the bug didn’t appear on all meshes in the scene. When importing fbx directly into UE5.4, the “Distance Field Indirect Shadow” option is disabled, so everything is fine. The problem turned out to be very easy to solve. Thank you very much for your help 
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