FSXA Added AI aircraft removed directly after adding it - why?

When I add an AI aircraft, I do sometimes see the same aircraft removed right after. So if I add an aircraft (let`s say with id 10) it is reported as removed instantly.

Reading about the reality bubble I understand there might be situations when I cannot add an AI aircraft. However, from my tests it looks all very random. So being located at position x, sometimes I can add aircraft on an airport about 50NM away, sometimes I can`t. When I add such an aircraft and it fails (actually adding does not fail, but is is removed afterwards - no errors while adding), then try again - it works.

Any idea why this happens or what`s the logic behind it?

Code:
            case SIMCONNECT_RECV_ID_EVENT_OBJECT_ADDREMOVE:
                {
                    const SIMCONNECT_RECV_EVENT_OBJECT_ADDREMOVE *event = static_cast<SIMCONNECT_RECV_EVENT_OBJECT_ADDREMOVE *>(pData);
                    const DWORD objectID = event->dwData;
                    const SIMCONNECT_SIMOBJECT_TYPE objectType = event->eObjType;
                    if (objectType != SIMCONNECT_SIMOBJECT_TYPE_AIRCRAFT && objectType != SIMCONNECT_SIMOBJECT_TYPE_HELICOPTER)
                    {
                        break;
                    }

                    // such an object is not necessarily one of ours
                    // for instance, I always see object 5 when I start the simulator
                    if (!simulatorFsx->getSimConnectObjects().isKnownSimObjectId(objectID)) break;
                    switch (event->uEventID)
                    {
                    case SystemEventObjectAdded:
                        // added in SIMCONNECT_RECV_ID_ASSIGNED_OBJECT_ID
                        break;
                    case SystemEventObjectRemoved:
                        simulatorFsx->simulatorReportedObjectRemoved(objectID);
                        break;
                    default:
                        break;
                    }
                    break;
                }
 
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