Android Nougat wpa_supplicant.conf id_str

Question

I have upgraded my Nexus 5 to Nougat (7.1.2) and had to wipe it. I tried to restore my WLAN networks by copying the old wpa_supplicant.conf, which crashed the whole wlan module. By comparing the old to the fresh file I noticed that on the new one the networks contain a new field id_str:

Old:

network={
    ssid="WLAN2"
    key_mgmt=NONE
    priority=1
}

New:

network={
    ssid="WLAN2"
    key_mgmt=NONE
    priority=1
    id_str="%7B%22creatorUid%22%3A%221000%22%2C%22configKey%22%3A%22%5C%22WLAN2%5C%22NONE%22%7D"
}

Is there any way to generate the id_str, such that dont have to reconfigure all the networks?