The event works as it should, but out of dozens of rounds, I have never received a medium red pouch, even experimenting and calculating exactly how many points I score. If I get one or two lucky golds, they always drop like little pouches. If four or eight, then like big pouches. But never as medium. Maybe it's tied to the chances, but if so, then apparently the percentage is very small. Which is not entirely fair, especially for those who want to use them for decorations. Other events don't have medium sizes and don't have this problem. Was the medium size removed for this event too? Because I honestly don't know what I need to do to get it.
1 - Start the Pig King event.
2 - Try to get a different number of points.
3 - Notice that you always (or very-very often) receive a reward either as only big or only small red pouches.