Problem in emissive in preview in architecture mode

Hello, I have a problem in Unreal Engine 4 in the architecture mode. I have an asset with emissive, my emissive is ok in my mesh and materials but when my mesh go to the preview in my scene, it don’t have emissive.

Do you know why? I tried to found a solution in the Unreal’s discord but no answer and in the documentation.

Thank you and have a nice dayt !