Ziggs Satchel Charge

Might be hard to reproduce, but I was playing Ziggs and got jumped by the Jax jungle in mid. Threw down satchel charge and just as I detonated it, counterstrike stunned me, somehow preventing my satchel charge from bouncing me to safety (it still bounced Jax away)

Normally, a stun doesn't affect displacements at all (charm just got fixed actually) but for some reason satchel charge has weird interactions. It makes sense that a snare stops him from bouncing off the charge, but a stun? Stuns don't stop any other movement abilities as far as I can tell.