Ancient Coin + Scavenger not stacking.
3 Games. 2 Bard, 1 Sona Support.
Used Ancient Coin with Scavenger Mastery in both Bard games. Ancient Coin was giving the gold from ally minion kills, Scavenger was not. Upon upgrading Ancient Coin to Nomad's Medallion or Talisman of Ascension, Scavenger began to stack with the item giving the proper gold.
In the game as Sona, I was not using Ancient Coin and Scavenger did award the 1 gold.
Not a large sample size I admit, so if anyone else could look into this as well, I'd appreciate it.