Dragon Strike Pull not triggering traps

Is there any reason why Jarvan IV's Dragon Strike to his Demacian Standard wouldn't trigger traps such as Teemo's mushrooms or Nidalee's traps.

I ask because I was playing a game as Teemo this weekend, and watched a J4 get pulled through my shroom to his Standard and not trigger it. It was not a new Shroom (it was certainly active) and was not disabled due to Sweeping Lens or similar.

I've added an image to show approximately how it happened. Could it be that the trap wasn't triggered due to terrain effects? I find it hard to believe, but does anyone else have any ideas.

I've had a look at the wiki, and I can't find any reference that suggests that Dragon Strike pull doesn't trigger traps. Can anyone replicate this behavior?