Yes, the range() function makes the trouble, because it creates a new dependency.
But it works, if you write “average(range(Isw.it, 4.5ms, 5ms))” directly into the diagram.
It also works with “Export=no” in an equation component. But then, the equation must be in the same document like the diagram. I.e. if you use a different document for the diagrams than for the schematic, place the equation together with the diagrams. “Export=no” is not necessary then.