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I did not have exactly the same thing, but it was also white lines, mine were showing up as lines of dashes evenly spaces about.
Mine was an interior space, so maybe that makes the difference. Similar enough that I’d recommend you check out the following in your model and see.
I discovered light sources were imported with geometry I’d brought in from another program that I did not need or want. They clashed with existing light sources in the model.
After deleting these unwanted import artifacts from the UE model, the white lines disappeared, and the lighting returned to normal.
I hope this helps, but your case may be something else entirely.