Fixes: #13844 - Change site filter to use available_at_site instead of site_id

netbox/ipam/forms/model_forms.py

@@ -214,7 +214,7 @@ class PrefixForm(TenancyForm, NetBoxModelForm):
         required=False,
         selector=True,
         query_params={
-            'site_id': '$site',
+            'available_at_site': '$site',
         },
         label=_('VLAN'),
     )