Yes. It’s a tutorial from the year 2015, but the problem doesn’t seem to be associated with that. Even when I disconnect the Specular from the material input, the result will remain the same.
It seems to be some sort of lighting problem inside the Material Editor, but I have no clue how to reset that - here’s an additional .gif where I have removed Specular and added 0.1 Emissive to the material (Here’s the result)
Another question: Why wouldn’t I want to use Specular in UE4 PBR workflow?
The problem could be related with this topic.