Blueberry-Peach Buckle

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4 tablespoons unsalted butter, at room temperature, plus more for the dish

1 2/3 cups all-purpose flour

1 1/2 teaspoons baking powder

1/4 teaspoon salt

3/4 cup granulated sugar

1/4 teaspoon finely grated orange zest

1 large egg

1/2 cup milk

2 cups blueberries

1 large peach, chopped

1/4 cup granulated sugar

2 tablespoons packed light brown sugar

3 tablespoons all-purpose flour

1/4 teaspoon freshly grated nutmeg

Pinch of salt

2 tablespoons unsalted butter, at room temperature

Vanilla ice cream, for serving