A then callback returns an already-resolved promise. Where does its value show up among the numbers?

Promise.resolve()
  .then(() => {
    console.log("a");
    return Promise.resolve("b");
  })
  .then((value) => console.log(value));
 
Promise.resolve()
  .then(() => console.log(1))
  .then(() => console.log(2))
  .then(() => console.log(3))
  .then(() => console.log(4));