CoronaSky Volume effect affect Background visibility under horizon

[Starline]

Hi,
if I use CoronaSky as scene environment (overriding max environment) with the volume effect on the background image, put in the direct visibility override slot, appears with the part below the horizon as gray, if i uncheck the volume effect, the part below the horizon appears correctly. Is this correct? There is no way to use the volume effect on the geometry without affecting the background image?
Thanks in advance,
Alessandro

[romullus]

Duplicate: https://forum.corona-renderer.com/index.php?topic=34292.0

also here: https://forum.corona-renderer.com/index.php?topic=38302.0

and here: https://forum.corona-renderer.com/index.php?topic=40550.0