Why my material is transparent in scene view, but isn't in game view and in the build?

I use URP.
I have a shader graph, that is setup as opaque surface type and “Allow Material Override” checked.

Also, I have a material, where surface type is overridden to transparent.

And I can observe, that this material is transparent only in the scene view, but not in game or build.]

Do you have a secondary camera set up in scene anywhere? I only ask because your skybox is also gone in the game view and normally, for me, it’s because I didn’t set up a secondary camera correctly in the scene.