issue since bluez 48 with ios pairing only

[Arthur LAMBERT <lambertarthur22@gmail.com>]

We used bluez in a firmware on a device used as peripheral with custom services and characteristics.
We are able to connect to this device with ios/android mobile app application and homemade linux client

We have an issue since bluez 48 and also on bluez 49 concerning pairing process with IOS.

After the pairing process, a pop up appears on IOS :

<<<<
Bluetooth Pairing Request
"XXXX" would like to pair with your Iphone

Cancel 	     Pair
>>>>

Before bluez 48, we did not see this pop up. Users have to click on Pair button to finish
the pairing process; Then in IOS side, a Disconnect trigger in code is no more able
to disconnect properly the device.

Are we doing something wrong to get this issue on bluez 48 ?

Current way to init our hci device :

btmgmt -i hci0 power off
btmgmt -i hci0 le on
btmgmt -i hci0 connectable on
btmgmt -i hci0 bredr off
btmgmt -i hci0 name XXXX
btmgmt -i hci0 advertising on
btmgmt -i hci0 power on

# btmgmt -i hci0 info
hci0:   Primary controller
addr XX:XX:XX:XX:XX:XX version 6 manufacturer 15 class 0x000000
supported settings: powered connectable fast-connectable discoverable bondable link-security ssp br/edr hs le advertising secure-conn debug-keys privacy static-addr
current settings: powered connectable bondable le advertising secure-conn
name TESTBENCH-V2
short name

I tried to play with other settings with btmgmt without be able to fix our issue.

Thanks,
Arthur.