Set Instant Pot to Sauté and add oil and 3 Tbsp butter. Once the oil is hot and butter is melted, add onion, garlic, bacon slices, and rosemary. Cook until the onions are softened and the garlic is browned, about 3 to 4 minutes.
Remove bacon and rosemary. Add pork, beef, 1/2 tsp salt, and 1/2 tsp black pepper. Stir to combine, cooking for a couple of minutes until the meat is browned.
Stir in red wine and allow to cook for about 5 minutes. Stir in all tomatoes (chopped and sun-dried).
Cover and cook on Manual pressure, on High, for 30 minutes. Quick release when it is finished cooking.
When you are about 15 minutes out from the sauce finishing, cook pasta in a pot of boiling salted water for the time listed on the packet instructions.
Drain pasta and return to the pan. Add a few ladlefuls of the Bolognese sauce, tossing to coat. Divide pasta between bowl and serve with a large helping of Bolognese on top. Finish with freshly grated Parmesan.