Using Ornate Spyglass still gives “Longsight” Buff, but locks the character in place, unable to look around, and the zoom effect zooms in only to normal base zoom-in for players.
So the item doesn’t zoom like normal, locks the camera in place unable to pan around using the mouse to look around.
This has been happening since Pre-patch of War Within and hasn’t been fixed.
-Added, This also applies to the Cursed Spyglass Toy, and similar items that cause the same zoom-in effect.