The uncooking of the dumplings may have something to do with the method.
Simply put, you need to boil water, cook on a gentle flame, tap cold water and stir more.
Before you put in the dumplings, you can gently pinch the dumplings with your hands to make them slightly cracked and easier to cook. Once the water boils, drop in the dumplings and gently push them with the back of a spoon to heat them evenly. Once the dumplings float, cook them over low heat, and when they come to a boil, dab on some cool water, about two to three times.
The rice dumplings from Inagiku Village do get undercooked easily when you make them yourself, so remember to open the lid to cook the filling, and cover the lid to cook the skin.