Dead link and work lost after completing lesson

Hello - just wanted to make you aware that there is a dead link (https://learn.freecodecamp.org/manipulating-complex-objects) in this lesson (https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-javascript/record-collection/).

Also, I used to be able to reference my work in completed lessons but now it is gone after I achieve it. I also enjoyed the control panel being available on the page to experiment. I have been using Console on the browser with the upgrade.