Pour vegetable broth into a large saucepan and bring to a boil. Add fresh cranberry beans and return to a boil. Reduce heat and simmer until beans are soft but not mushy, 20 to 25 minutes. Remove beans with a slotted spoon, leaving the vegetable broth over the heat source on medium-low.

Heat olive oil and butter in a large saucepan over medium-high heat. Add onion, garlic, whole rosemary sprig, bay leaf, and sage. Sauté until onion is soft and translucent, about 7 minutes. Add rice and stir to toast the rice, 2 to 3 minutes. Once rice is toasted, add drained beans and stir until well coated.

Add white wine and stir until wine is fully absorbed. Add 1/2 cup broth to the rice and stir until the broth is absorbed. Continue adding 1/2 cup of broth at a time, stirring continuously, until the liquid is absorbed and the rice is al dente. Add tomato sauce and stir until creamy and thick. This whole process will take about 18 minutes.