fix issue with sharing

sync/views.py

@@ -270,7 +270,7 @@ class LogProcessingResult:
                     self._remove_revocation(log.model_name, log.model_id)
 
                     # Add to grant instances if not already there
-                    if log.model_id not in self.grant_instances[log.model_name]:
+                    if log.model_id not in self.shared_instances[log.model_name]:
                         model = model_registry.get_model(log.model_name)
                         try:
                             instance = model.objects.get(id=log.model_id)
@@ -319,11 +319,11 @@ class LogProcessingResult:
 
     def _remove_grant(self, model_name, model_id):
         """Remove any grant entries for the specified model and ID."""
-        if model_name in self.grant_instances and model_id in self.grant_instances[model_name]:
-            del self.grant_instances[model_name][model_id]
+        if model_name in self.shared_instances and model_id in self.shared_instances[model_name]:
+            del self.shared_instances[model_name][model_id]
             # Clean up empty dictionaries
-            if not self.grant_instances[model_name]:
-                del self.grant_instances[model_name]
+            if not self.shared_instances[model_name]:
+                del self.shared_instances[model_name]
 
     def process_shared(self):
         """Process grants and their hierarchies."""