Unable to pull ubuntu image through dependency proxy

GitLab CI/CD
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1

Since this afternoon, I am unable to pull the ubuntu image through a dependency proxy on my self hosted gitlab instance. Before this afternoon, the dependency proxy worked as expected.

What works

docker pull [selfhosted-gitlab-instance]/[groupA]/dependency_proxy/containers/alpine:latest
# or
docker pull [selfhosted-gitlab-instance]/[groupA]/dependency_proxy/containers/mysql
# or
docker pull [selfhosted-gitlab-instance]/[groupB]/dependency_proxy/containers/mysql

What does not work

docker pull [selfhosted-gitlab-instance]/[groupA]/dependency_proxy/containers/ubuntu:latest
# or
docker pull [selfhosted-gitlab-instance]/[groupA]/dependency_proxy/containers/ubuntu:20.04
# or 
docker pull [selfhosted-gitlab-instance]/[groupA]/dependency_proxy/containers/ubuntu
# or 
docker pull [selfhosted-gitlab-instance]/[groupB]/dependency_proxy/containers/ubuntu

I get a 404 error each time:

<!DOCTYPE html>
<html>
<head>
  <meta content="width=device-width, initial-scale=1, maximum-scale=1" name="viewport">
  <title>The page you're looking for could not be found (404)</title>
  <style>
    body {
      color: #666;
      text-align: center;
      font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
      margin: auto;
      font-size: 14px;
    }

    h1 {
      font-size: 56px;
      line-height: 100px;
      font-weight: 400;
      color: #456;
    }

    h2 {
      font-size: 24px;
      color: #666;
      line-height: 1.5em;
    }

    h3 {
      color: #456;
      font-size: 20px;
      font-weight: 400;
      line-height: 28px;
    }

    hr {
      max-width: 800px;
      margin: 18px auto;
      border: 0;
      border-top: 1px solid #EEE;
      border-bottom: 1px solid white;
    }

    img {
      max-width: 40vw;
      display: block;
      margin: 40px auto;
    }

    a {
      line-height: 100px;
      font-weight: 400;
      color: #4A8BEE;
      font-size: 18px;
      text-decoration: none;
    }

    .container {
      margin: auto 20px;
    }

    .go-back {
      display: none;
    }

  </style>
</head>

<body>
  <a href="/">
    <img src='data:image/svg+xml;base64,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' alt="GitLab"/>
  </a>
  <h1>
    404
  </h1>
  <div class="container">
    <h3>The page could not be found or you don't have permission to view it.</h3>
    <hr />
    <p>The resource that you are attempting to access does not exist or you don't have the necessary permissions to view it.</p>
    <p>Make sure the address is correct and that the page hasn't moved.</p>
    <p>Please contact your GitLab administrator if you think this is a mistake.</p>
    <a href="javascript:history.back()" class="js-go-back go-back">Go back</a>
  </div>
  <script>
    (function () {
      var goBack = document.querySelector('.js-go-back');

      if (history.length > 1) {
        goBack.style.display = 'inline';
      }
    })();
  </script>
</body>
</html>

Regardless of the group, I am unable to pull only the ubuntu image, regardless of tag. All other images I tested work, it does not make a difference if they are already listed in de dependency cache or not.