Instant Pot Seafood Chowder

Name: Instant Pot Seafood Chowder
Ingredients: 4 slices bacon, cut into 1-inch pieces; 5 cloves garlic, minced; 1 medium onion, diced; 3 stalks celery, thinly sliced; 1 medium carrot, diced; 4 medium russet potatoes, peeled and cubed; 1 (14 ounce) can whole kernel corn; 2 cups vegetable broth; 6 (4 ounce) haddock fillets; 1 cup uncooked medium shrimp, peeled and deveined; 1 cup sea scallops; 1 tablespoon chopped fresh thyme; 1 pinch red pepper flakes, or to taste; ground black pepper to taste; 2 tablespoons cornstarch; 2 tablespoons water; 1 cup milk