I checked and noticed that the package manager module is part of the 8.x-2.x-...

I checked and noticed that the package manager module is part of the 8.x-2.x-dev release of automatic updates and the project browser has marked minimum stability is beta in composer.json. I think it would be better to revert the MR https://www.drupal.org/project/project_browser/issues/3245770 for now.