For Get Attribute - visibility:
AttributeVisibility.Equals(0) … If true : The element is visible
AttributeVisibility.Equals(1) … If true : The element is not visible
AttributeVisibility(Int32) is my outArgument of Get Attribute Activity in this case
0 is true and 1 is false in this case.
I think you had it the other way round.
Edit: also make sure that your UiPathStudio does not occlude the selector.