Just like @nSpeednSpeed I can confirm - also with ERDGInitialDataFlags::None + nvidia 522.25 - the lightmaps look great again without any strange artifacts. Really thanks for so quickly investigating this @Luoshuang.
Edit: once thing I did find while testing is what looks like some sort of lightmap-mip scaling effect on the edges of the lightmap uvs. Especially in VR its very noticable. See pic - when moving more near the dark edges disappear.
Disabling VirtualTextures makes this way less noticable but its still there.
