Im sure it’s a new output i don’t know about.
But what happens when you plug it into the world position offset which is the pin used since always to do displacement before this other pin was added?
Assuming 2 two work somewhat similar, the problem is probably the fact you dont have a vertex normal multiplication in there to tell it what direction to move the vertex in.
if the new USF does this internally, then i have no idea.
Its something for you to try anyway…