Zilean's passive should give assists

I was in a game where I as support Zilean and my adc who was Lucian were pushing the enemy laners under turret. My Lucian was level 5 and my passive came up. I put my passive on to him which gave him level 6. Immediately, Lucian levels up his ult and gets a kill on the enemy ADC under turret. I did not get an assist. What the hell? Felt bad. :(
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