Relic shield lineup wouldn't execute minions

So basically like the title says the items relic shield , targons brace and face of the mountain execute on minions wasn't working. The passive would still give the gold and health to another nearby player when you killed a minion but because the execute feature of that passive was not working minions were not dying when their health was below the specified execute amount that the items listed

so basically in a nut shell having the item and upgrading the item should have made it easier to last hit minions but because it wasn't working it was simply not having that minion below health damage bonus at all on any of those items like it should.

I mean if it was working I should've been able to last hit a caster minion at level 10 from at least 1/5 of its heath easy with face of the mountain but instead it took going down to what an ordinary auto attack as thresh with no damage items amount of life in order to last hit them them all game long not to mention in past games it was easy to use the passive charges but this game it was a bit more of a challenge and downright irritating that it wasn't working which is why I'm posting about it (I don't need a reply I'm just informing that this happened)