Fail to process Drupal 7 core releases

I noticed Drupal 7 core releases are not getting included in the Project Dependency database tables. This is causing some dependencies to not be found. This does not seem to cause problems other than warning messages but I suppose could result in more serious problems in some cases. For Drupal 7.28 the code

$version = project_dependency_core_api_from_term($tag);
$info_file_pattern = $version >7 ? '.info.yml' : '.info';

$tag is 7.28. The result $version is 7.28. Since 7.28 is greater than 7 Project Dependency looks for .info.yml files. Looking at the function.

function project_dependency_core_api_from_term($core_api_term_name) {
  return preg_replace('/\.x.*$/', '', $core_api_term_name);
}

Contributed modules are something like 7.x-1.0 so this works. But the Drupal core releases do not have a 'x' in 7.28. I am curious about the history of this code but it seems like it is a bug.