[GAMEPLAY] bug Relic Shield not activating

I played a Co-op vs AI Intermediate match as Thresh and started with a relic shield. Throughout the entirety of the match the relic shield passive of auto-killing low health minions when you attack them did not trigger, however the passive of sharing gold and healing my ally when I got a minion kill still triggered normally. I also upgraded it to targon's brace and face of the mountain but they still did not trigger the minion auto-kill passive and worked normally otherwise.