do...while loop, Evaluate to False ... Correct Answer, but there's a bug?

SOURCE: https://teamtreehouse.com/library/javascript-loops/simplify-repetitive-tasks-with-loops/create-a-dowhile-loop

This is the solution that passed the test:

// Display the prompt dialogue while the value assigned to `secret` is not equal to "sesame"

let secret = prompt("What is the secret password?");

do {
    secret = prompt(`That's not it! Try again ... 
    What is the secret password?`);

} while ( secret !== "sesame");
alert("You know the secret password. Welcome!");

What happens is:

1. The prompt dialogue box pops up for you to enter the password.
2. Enter an incorrect password, and the do...while loop causes the prompt to reappear, with the additional message "That's not it! Try again ..."

The problem occurs when a use enters the CORRECT answer on the first attempt. The code inside the do...while loop runs once, which is normal, but it runs the password prompt, which it shouldn't do, because the user has already submitted the correct answer.

Shouldn't this task have been a while loop, rather than a do...while?

This appeared to work better:

let secret = prompt("What is the secret password?");

while (secret !== "sesame") {
    secret = prompt(`That's not it! Try again ... 
    What is the secret password?`);
}
alert("You know the secret password. Welcome!");
console.log("You know the secret password. Welcome!");