Kalista Passive and Relic Shield

I was playing as thresh earlier with relic shield, and whenever Kalista's passive was on an enemy minion, relic shield would not proc on last hits? The relic shield did proc just fine without Kalista's passive. I don't know if this is intentional but it seems kind of weird. Just wanted to go ahead and report it to see if it wasn't actually intentional. Thanks! <3
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