Hey, just wanted to chime in with my findings for anyone else who finds this thread on google.
The straight line occuring only during render queue is due to a pair of CVars that gets applied by the ‘Cinematic Quality’ scalability settings, which seem to clash with UDS. You can test this by flicking the viewport’s ‘Effects’ setting between Cinematic and Epic.
Specifically
r.SkyAtmosphere.FastSkyLUT = 0
r.SkyAtmosphere.AerialPerspectiveLUT.FastApplyOnOpaque = 0
Go into your console overrides in your pipeline configuration and set them both back to 1, and it’ll render the same as it does in viewport.