It apparently doesn't work, that is, it won't let you summon near it (like the skill description says you should), and according to debug mode, it has a hitbox of a circle.

I'm not sure whether the hitbox changing to a circle is a bug though...

Yesterday, i summoned two invisible apples during my sham turn but they were like "visible" apples and other players could touch them. Also, when i wanted to teleport something around the apples, it didn't work.