Fix CustomFieldSerializer content_types queryset

netbox/extras/api/serializers.py

@@ -31,7 +31,7 @@ from .nested_serializers import *
 class CustomFieldSerializer(ValidatedModelSerializer):
     url = serializers.HyperlinkedIdentityField(view_name='extras-api:customfield-detail')
     content_types = ContentTypeField(
-        queryset=ContentType.objects.filter(FeatureQuery('export_templates').get_query()),
+        queryset=ContentType.objects.filter(FeatureQuery('custom_fields').get_query()),
         many=True
     )
     type = ChoiceField(choices=CustomFieldTypeChoices)