Non-connectable Long Range advertisement

Question

Hi, 
 We're using nRF52840 rev. A with s140_nrf52840_6.0.0-6.alpha SoftDevice and patched SDK 14.2.0. We've succesfully launched Long Range advertisements on one device and LR scanner on another.
However we don't neeed the device to be connectable, so obviously we've tried setting .connectable = 0, . The problem is that function sd_ble_gap_adv_start returns NRF_ERROR_INTERNAL . Any idea why or (even better) how to launch this? Here's our code: 
 uint32_t bluetooth_advertisingInit(void)
{
	uint8_t custom_data[8] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07};
	ble_advdata_manuf_data_t manuf_data =
	{
 .company_identifier = 0xFFFF,
 .data.size = 8,
 .data.p_data = custom_data,
	};
	ble_advdata_t adv_data;
	memset(&adv_data, 0, sizeof(adv_data));
	adv_data.name_type = BLE_ADVDATA_NO_NAME;
	adv_data.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
	adv_data.include_appearance = false;
	adv_data.p_manuf_specific_data = &manuf_data;

 ret_code_t err_code = ble_advdata_set(&adv_data, NULL);
 APP_ERROR_CHECK(err_code);
 app_timer_create(&bluetooth_advertisementTimer,
 APP_TIMER_MODE_SINGLE_SHOT,
 bluetooth_advertisementTimerHandler);


#if defined(S140)
 // Set maximum output power for advertiser, scanner, and initiator.
 sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, BLE_CONN_HANDLE_INVALID, 9);
 sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_SCAN_INIT, BLE_CONN_HANDLE_INVALID, 9);
#endif
 return err_code;
}

void bluetooth_advertisingStart(void)
{
 ble_gap_adv_params_t const adv_params =
 {
 .properties =
 {
 .connectable = 0,
 .scannable = 0,
 .directed = 0,
 .high_duty = 0,
 .legacy_pdu = 0,
 .anonymous = 0,
 },
 .p_peer_addr = NULL,
 .fp = BLE_GAP_ADV_FP_ANY,
 .interval = BLUETOOTH_ADVERTISEMENT_FAST_INTERVAL,
 .duration = 0,
 .scan_req_notification = 0,
#if defined(S140)
 .primary_phy = BLE_GAP_PHY_CODED,
 .secondary_phy = BLE_GAP_PHY_CODED,
#else
 .primary_phy = BLE_GAP_PHY_1MBPS,
 .secondary_phy = BLE_GAP_PHY_1MBPS,
#endif
 };
 ret_code_t err_code = sd_ble_gap_adv_start(BLE_GAP_ADV_SET_HANDLE_DEFAULT, &adv_params, BLUETOOTH_CONNECTION_CONFIG_TAG);
 APP_ERROR_CHECK(err_code);
}