BleDelegate: after pairDevice returns a valid Device, no onConnectedStateChanged is called back

Environment

• Device: Edge 840, firmware 31.33
• ConnectIQ-API-Version: 6.0.0
• ConnectIQ-Version: 6.0.0
• App type: Data Field
• minSdkVersion in manifest: 3.2.0

What I'm trying to do

I'm writing a Data Field that connects as a BLE central to a third-party BLE peripheral (not a Garmin sensor) and talks to it over a custom GATT service/characteristics. Scanning, profile registration, and advertisement filtering all work correctly. The problem is that after pairDevice() returns a valid, non-null Device object, onConnectedStateChanged() is never called - not with CONNECTION_STATE_CONNECTED, not with any disconnected/error state either. Just silence.

Remarks

• On the first run, Bluetooth confirmation about open connection is being displayed and I accepted it.
• I always test on real device, not in simulator.

What I've verified so far

• registerProfile() succeeds: onProfileRegister fires with status == STATUS_SUCCESS for my service UUID.
• onScanResults() correctly identifies the target device by its advertised service UUID.
• getAvailableConnectionCount() returns 6 immediately before calling pairDevice(), so this isn't the documented "max 3 concurrent connections" limit.
• pairDevice(result) returns a non-null Device object (confirmed via System.println), so the call itself isn't failing outright.
• After that, I waited well beyond any reasonable connection/bonding timeout (up to ~20-30 seconds across multiple runs), and onConnectedStateChanged simply never fires - no success, no failure.

Minimal repro

function onScanResults(scanResults as Iterator) as Void {
    for (var item = scanResults.next(); item != null; item = scanResults.next()) {
        var result = item as ScanResult;
        if (isTargetAdvert(result)) {
            stopScan();

            var device = pairDevice(result);
            System.println("pairDevice() returned: " + device);
            // device is non-null here, but onConnectedStateChanged is
            // never subsequently invoked for it.
            return;
        }
    }
}

function onConnectedStateChanged(device as Device, state as BluetoothLowEnergy.ConnectionState) as Void {
    // This never runs, in either branch.
    System.println("onConnectedStateChanged: " + state);
}

Questions

1. Is a non-null return from pairDevice() actually a guarantee that a connection attempt was started at the radio/GATT level, or can it return a Device handle even when the attempt silently fails to begin?
2. Are there known issues with BLE central connections to non-Garmin peripherals on Edge 840 / firmware 31.33 / CIQ API 6.0.0?
3. If the peripheral requires GATT-level encryption/bonding, would that surface as a native OS-level pairing/passkey prompt on the Edge's screen? If so, is there any API-level signal (callback, state, log) that such a prompt is pending, since my Data Field has no visibility into that beyond the missing callback?
4. Is there any additional API call needed beyond pairDevice() to actually initiate/complete the GATT connection, or is pairDevice() supposed to be sufficient on its own?

Any pointers - even just "check X" - would be appreciated.

Update

I tried with this CIQ app: https://apps.garmin.com/en-US/apps/9bcc8b66-8385-4afb-b93e-f69e01422284

When I hit "Connect", labels turn orange, and never green. So I believe this is blocking my desire to connect to this camera.