reverted:
--- b/core/modules/tracker/tracker.pages.inc
+++ a/core/modules/tracker/tracker.pages.inc
@@ -70,7 +70,6 @@
       else {
         $nodes[$nid]->last_comment_timestamp = max($nodes[$nid]->last_comment_timestamp, $statistics->last_comment_timestamp);
       }
-      $nodes[$nid]->last_comment_field_name = $statistics->field_name;
     }
 
     // Display the data.
@@ -106,7 +105,6 @@
           'class' => ['comments'],
           'data' => $comments,
           'data-history-node-last-comment-timestamp' => $node->last_comment_timestamp,
-          'data-history-node-last-comment-field-name' => $node->last_comment_field_name,
         ],
         'last updated' => [
           'data' => t('@time ago', [
only in patch2:
unchanged:
--- a/core/modules/tracker/src/Controller/TrackerController.php
+++ b/core/modules/tracker/src/Controller/TrackerController.php
@@ -179,6 +179,7 @@ public function buildContent(UserInterface $user = NULL) {
         else {
           $tracker_data[$nid]->last_comment_timestamp = max($tracker_data[$nid]->last_comment_timestamp, $statistics->last_comment_timestamp);
         }
+        $tracker_data[$nid]->last_comment_field_name = $statistics->field_name;
       }
 
       // Display the data.
@@ -209,6 +210,7 @@ public function buildContent(UserInterface $user = NULL) {
             'class' => ['comments'],
             'data' => $tracker_data[$node->id()]->comment_count ?? 0,
             'data-history-node-last-comment-timestamp' => $tracker_data[$node->id()]->last_comment_timestamp ?? 0,
+            'data-history-node-last-comment-field-name' => $tracker_data[$node->id()]->last_comment_field_name,
           ],
           'last updated' => [
             'data' => t('@time ago', [