Entity Reference Revision not loaded in EntityReferenceFormatterBase

Thank you for reporting. Appears to have test failures and will need test coverage

This issue causes the display of invalid information on the Content Moderation "Latest version" tab. Specifically, it does not actually display the data from the latest version, it displays information from the default/published version. Adding the "content moderation" issue tag.

After reading the description of priorities I believe it qualifies a Major, as it is displaying incorrect data.

target_revision_id does not appear on every item. I expect this is why the tests are failing.

I have an alternative solution, also attached as a file, that is solving the issue on my system. I don't believe this is the best solution, but I think it will advance discussion on the issue.

$item sometimes has a target_revision_id and sometimes not. This code uses the target_revision_id if available, and falls back to target_id when it isn't. According to the comments "multiple entity load" should be used, so this was used to load the revised version.

Perhaps all items should have a target_revision_id so that all the entities could be loaded by revision id? This would work even if revisions were not enabled, since every entity has a revision id. This would require an upstream change to what ever is producing $item.

There is also EntityReferenceRevisionsFormatterBase. I'm not sure where it fits in the picture.

--- core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceFormatterBase.php	2024-06-20 09:17:49
+++ core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceFormatterBaseFix.php	2024-06-20 09:21:59
@@ -122,6 +122,7 @@
     // "entity reference item lists" being displayed. We thus cannot use
     // \Drupal\Core\Field\EntityReferenceFieldItemList::referencedEntities().
     $ids = [];
+    $vids = [];
     foreach ($entities_items as $items) {
       foreach ($items as $item) {
         // To avoid trying to reload non-existent entities in
@@ -130,13 +131,25 @@
         // at FALSE.
         $item->_loaded = FALSE;
         if ($this->needsEntityLoad($item)) {
-          $ids[] = $item->target_id;
+          if (!is_null($item->target_revision_id)) {
+            $vids[] = $item->target_revision_id;
+          }
+          else {
+            $ids[] = $item->target_id;
+          }
         }
       }
     }
-    if ($ids) {
+    if ($ids || $vids) {
       $target_type = $this->getFieldSetting('target_type');
-      $target_entities = \Drupal::entityTypeManager()->getStorage($target_type)->loadMultiple($ids);
+      $storage = \Drupal::entityTypeManager()->getStorage($target_type);
+      $target_entities = ($ids) ? $storage->loadMultiple($ids) : [];
+      if ($vids) {
+        $target_entities_vids = $storage->loadMultipleRevisions($vids);
+        foreach ($target_entities_vids as $target_entity) {
+          $target_entities[$target_entity->id()] = $target_entity;
+        }
+      }
     }
 
     // For each item, pre-populate the loaded entity in $item->entity, and set

Sorry, did not mean to remove the "Needs tests" tag. Re-adding.