Calling bleno.disconnect() disconnects device but blocks new connection for another 20secs

Hi, I want to diconnect an inactive device, therefore I am calling bleno.disconnect(). The device gets disconnected - this is the expected behaviour but the device is not able to reconnect for another 20secs.

I am running bleno on a Nano Pi Neo Air, Ubuntu 16.04.2 LTS 4.11.2

hcidump -t -x outputs after bleno.disconnect():

2017-08-18 23:23:05.764200 < HCI Command: Disconnect (0x01|0x0006) plen 3
    handle 64 reason 0x13
    Reason: Remote User Terminated Connection
2017-08-18 23:23:05.767576 > HCI Event: Command Status (0x0f) plen 4
    Disconnect (0x01|0x0006) status 0x00 ncmd 1
2017-08-18 23:23:25.708081 > HCI Event: Disconn Complete (0x05) plen 4
    status 0x00 handle 64 reason 0x22
    Reason: LMP Response Timeout
2017-08-18 23:23:25.796586 < HCI Command: LE Set Advertise Enable (0x08|0x000a) plen 1
  01
2017-08-18 23:23:25.800573 > HCI Event: Command Complete (0x0e) plen 4
    LE Set Advertise Enable (0x08|0x000a) ncmd 1
    status 0x00

hcidump -t -x outputs this using nRF Connect:

2017-08-18 23:27:54.794896 > HCI Event: Disconn Complete (0x05) plen 4
    status 0x00 handle 64 reason 0x13
    Reason: Remote User Terminated Connection
2017-08-18 23:27:54.866602 < HCI Command: LE Set Advertise Enable (0x08|0x000a) plen 1
  01
2017-08-18 23:27:54.869356 > HCI Event: Command Complete (0x0e) plen 4
    LE Set Advertise Enable (0x08|0x000a) ncmd 1
    status 0x00

Thanks for your feedback!