Drupal 10
metatag 2.0.0
#38 Metatag.php replace lines 36-38 with:
$metatag_basic = $metatag_manager->sortedGroupsWithTags()['basic']['tags'] ?? [];
$metatag_og = $metatag_manager->sortedGroupsWithTags()['open_graph']['tags'] ?? [];
$metatag_advanced = $metatag_manager->sortedGroupsWithTags()['advanced']['tags'] ?? [];