The issue should be fixed in Nailgun: after saving custom data by clicking Apply Changes (PUT /api/nodes/node_id/interfaces) Load Defaults (GET /api/nodes/node_id/interfaces/default_assignment) becomes to response with this particular saved data and not default values.
The issue should be fixed in Nailgun: after saving custom data by clicking Apply Changes (PUT /api/nodes/ node_id/ interfaces) Load Defaults (GET /api/nodes/ node_id/ interfaces/ default_ assignment) becomes to response with this particular saved data and not default values.