Snapshot from the frame with the artefact.
I can not upload the video here so I made an Imgur post of the me showing how to do it. In the video the artefact only shows up once, but in game it shows up every single time, but only for a few frames and the videos low framerate hide them unfortunately.
To see it for yourself you need to have a level with any volumetric clouds and sky atmosphere. Set the editor camera to speed 8 and the speed scalar to 5 then decent into the cloud domain. You need to have the horizon on screen. When entering the cloud domain you will see a white blip similar to the screenshot above. This also works in play with when flying 2000km/h. The speed range is quite large so and it appears at 20000km/h too.
How do I get rid of this white flash?