Skylight imported from Blueprint doesnt show In editor

I created an Actor Blueprint with a skylight; an atmospheric fog and a Directional Light. (it’s a sky sistem)
As i was working it was perfect, but the moment I delete the blueprint, and imported again. the Skylight is not showing anymore, untill I tweak values or I play theproject… then the light shows up again, and disapear as I stop the simulation…

I add a PDF with the problem.

Also I was able to reproduce this problem in a blank file with a simpler version.

Ahyone? Is it a bug? I need answer to pack this blueprint and submit it into the Marketplace.