Treasure Hunt Refill Rules?

In the Treasure Hunt minigame, does anyone know the rule for what new symbols refill the board? I’ve been assuming that it’s just 1/4 each, bronze, silver, gold, coin pouch. But I find it hard to keep track of what’s a refill, after all the cascades fly by…

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You have the right possibilities, but I don’t know if anyone has ever determined whether it is 25 percent each or some other ratio.