Issue #3254404: TOC block isn't displayed in the Latest version

src/Plugin/Block/TocBlockBase.php

@@ -102,6 +102,9 @@ abstract class TocBlockBase extends BlockBase {
    */
   protected function getCurrentNode() {
     switch (\Drupal::routeMatch()->getRouteName()) {
+      // Look at the request's node latest version.
+      case 'entity.node.latest_version':
+        return \Drupal::routeMatch()->getParameter('node');
       // Look at the request's node revision.
       case 'node.revision_show':
         return node_revision_load(\Drupal::routeMatch()->getParameter('node_revision'));