Fix front ports queryset

netbox/dcim/forms.py

@@ -2032,7 +2032,7 @@ class FrontPortCreateForm(ComponentForm):
         # Determine which rear port positions are occupied. These will be excluded from the list of available mappings.
         occupied_port_positions = [
             (front_port.rear_port_id, front_port.rear_port_position)
-            for front_port in self.parent.front_port_templates.all()
+            for front_port in self.parent.frontports.all()
         ]
 
         # Populate rear port choices