Ok found it. In case anyone needs it, it was because of wrong Z location of the SkyAtmosphere location. The ground of my level is -50 000 z and the “transform mode” of the SkyAtmosphere component was set to default “planet top at absolute world origin” (so Z=0)
Setting it to “planet top at component transform” and moving the location of the SkyAtmosphere component to Z= -50 000 solved it.
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