[debug]

src/PersistentData/Model/ModelWithSlug.php

@@ -22,6 +22,8 @@ abstract class ModelWithSlug extends Model
     {
         if ($this->slug === null) {
             $this->slug = $this->generateSlug();
+            var_dump('getSlug called');
+            var_dump($this->slug);
         }
 
         return $this->slug;

src/PersistentData/PersistentDataManager.php

@@ -113,6 +113,10 @@ class PersistentDataManager implements IPersistentDataManager
                 }
             }
 
+            var_dump($original);
+            var_dump($modified);
+            var_dump($diff);
+
             if (count($modified) > 0) {
                 if ($model instanceof ModelWithSlug && isset($modified['slug'])) {
                     $modified['slug'] = $this->generateUniqueSlug($model, $modified['slug']);