[GAMEPLAY} Jhin - Invisible Jhin Trap Trigger Effect

I was playing as Fiddlesticks on ARAM, and I walked into the blue side mid-brush and got hit by an invisible Jhin trap. Could not see the effect going off, only the slow and his vision gained on us was shown. My teammate (the Nami) could not see the trap effect either.

Was not able to replicate this at all.