(NRF/GATT).getPrimaryService() error handling issue

I'm going nuts. Trying to discover devices, services, characteristics.
When everything exists - no problem.
But I'd like to handle that a service is not defined.

This is my simplified code:

NRF.requestDevice({filters: [{namePrefix: 'Puck.js'}]}).then(dev=>{
  console.log("device found", dev);
  return dev.gatt.connect();
}).then(conn=>{
  console.log("connected", conn);
  return conn.getPrimaryService(0x464F);
}).then(s=>{
  console.log("service found", s);
},f=>{
  console.log("no service found", f);
}).catch(e=>{
  console.log( "error:", e );
});

On execution neither f=>{ nor .catch(e=>{ are called:

device found BluetoothDevice {
  "id": "f9:2d:30:24:38:a4 random",
  "rssi": -51,
  "services": [  ],
  "data": new ArrayBuffer([2, 1, 5, 13, 9, 80, 117, 99, 107, 46, 106, 115, 32, 51, 56, 97, 52]),
  "name": "Puck.js 38a4"
 }
connected BluetoothRemoteGATTServer {
  "device": BluetoothDevice {
    "id": "f9:2d:30:24:38:a4 random",
    "rssi": -51,
    "services": [  ],
    "data": new ArrayBuffer([2, 1, 5, 13, 9, 80, 117, 99, 107, 46, 106, 115, 32, 51, 56, 97, 52]),
    "name": "Puck.js 38a4",
    "gatt":  ...
   },
  "connected": true }
Uncaught Error: Unhandled promise rejection: No Services found

Is this a bug or have I messed up my Promises?