Issue #3232001: activity tracker cron calls \Drupal::service('comment.statistics')->read in a wrong way

core/modules/tracker/tracker.module

@@ -265,9 +265,9 @@ function _tracker_add($nid, $uid, $changed) {
  */
 function _tracker_calculate_changed($node) {
   $changed = $node->getChangedTime();
-  $latest_comment = \Drupal::service('comment.statistics')->read([$node], 'node', FALSE);
-  if ($latest_comment && $latest_comment->last_comment_timestamp > $changed) {
-    $changed = $latest_comment->last_comment_timestamp;
+  $latest_comment = \Drupal::service('comment.statistics')->read([$node->id() => $node], 'node', FALSE);
+  if (is_array($latest_comment) && $latest_comment[0]->last_comment_timestamp > $changed) {
+    $changed = $latest_comment[0]->last_comment_timestamp;
   }
   return $changed;
 }