Notification about result of first measurement does not reach frontend

Notification about result of first measurement run ({'async_id': 'someid', 'passed': true}) does not reach frontend through WS. However the second and any additional measurement will successfully send the "end of measurement" notification.

Example run

===================== message recieved for 'foris-controller/0000000B00007B3C/request/librespeed/action/measure' =====================
{
  "reply_msg_id": "96720bea-1237-4d5f-ae3c-2b95e8d8caf1"
}
======================================================================================================================================
===================== message recieved for 'foris-controller/0000000B00007B3C/reply/96720bea-1237-4d5f-ae3c-2b95e8d8caf1' =====================
{
  "kind": "reply",
  "module": "librespeed",
  "action": "measure",
  "data": {
    "async_id": "1d80efe569b5174f"
  }
}
===============================================================================================================================================
===================== message recieved for 'foris-controller/0000000B00007B3C/reply/96720bea-1237-4d5f-ae3c-2b95e8d8caf1' =====================
b''
===============================================================================================================================================
===================== message recieved for 'foris-controller/0000000B00007B3C/request/librespeed/action/measure' =====================
{
  "reply_msg_id": "3dbc088c-7363-4a63-aacd-0fe9908491be"
}
======================================================================================================================================
===================== message recieved for 'foris-controller/0000000B00007B3C/reply/3dbc088c-7363-4a63-aacd-0fe9908491be' =====================
{
  "kind": "reply",
  "module": "librespeed",
  "action": "measure",
  "data": {
    "async_id": "2e3ef465c6f3398d"
  }
}
===============================================================================================================================================
===================== message recieved for 'foris-controller/0000000B00007B3C/reply/3dbc088c-7363-4a63-aacd-0fe9908491be' =====================
b''
===============================================================================================================================================
===================== message recieved for 'foris-controller/0000000B00007B3C/notification/librespeed/action/measure' =====================
{
  "module": "librespeed",
  "kind": "notification",
  "action": "measure",
  "data": {
    "async_id": "2e3ef465c6f3398d",
    "passed": true
  }
}

Good way to reproduce this issue is to run librespeed measurement soon after TOS boot.

I am not completely sure whether foris-controller module is the culprit here, so feel free to move this issue elsewhere.