Volumetric fog issue

I'm facing some problems with volumetric fog in 5.4.
There is a difference between the Editor:
editor.jpg (297.5 KiB) Viewed 987 times
and the launcher:
launcher.jpg (404.22 KiB) Viewed 987 times
In the launcher the fog is broken with a strange dark square in the sun.
Why this difference between the launcher and the editor? Is there something I can change to fix?

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