Clarisse 4.0 light shadow bug? SOLVED

Hi!
I just noticed strange behaviour which seems bug to me but as I may be wrong, I decided to write here first
Please see the attached project, there is only one distant light, one sphere light and one polygrid, nothing else.
I cannot understand why the sphere light casts shadow even when it is Unseen by camera. I think lights should never cast shadows and that does not happen in Clarisse 3.6. In 4.0 that happens even with Legacy mode
Shadow appears when the Radius is very small but when radius is increased, the shadow appears and it is impossible to get rid of it.
Am I doing something wrong or is this bug?
Thank you!
Antti
I just noticed strange behaviour which seems bug to me but as I may be wrong, I decided to write here first

Please see the attached project, there is only one distant light, one sphere light and one polygrid, nothing else.
I cannot understand why the sphere light casts shadow even when it is Unseen by camera. I think lights should never cast shadows and that does not happen in Clarisse 3.6. In 4.0 that happens even with Legacy mode

Shadow appears when the Radius is very small but when radius is increased, the shadow appears and it is impossible to get rid of it.
Am I doing something wrong or is this bug?

Thank you!
Antti