different pools based on class

Related: https://support.isc.org/Ticket/Display.html?id=16773

Scenario: Kea configured with one subnet with two pools inside, one pool is "open" second is only for client that will be assigned to class "super-fun-clients". Class will be assigned via global reservation.

Problem: I can't make it work, either all clients get all addresses or non of the clients are able to get "super-fun-clients" pool.

Example configuration (I tried more, but this one is, what I think, correct)

{
    "Dhcp4": {
        "client-classes": [
            {
                "name": "super-fun-clients", 
                "only-if-required": true
            }
        ], 
        "hooks-libraries": [], 
        "interfaces-config": {
            "interfaces": [
                "enp0s9"
            ]
        }, 
        "lease-database": {
            "type": "memfile"
        }, 
        "loggers": [
            {
                "debuglevel": 99, 
                "name": "kea-dhcp4", 
                "output_options": [
                    {
                        "output": "/home/wlodek/installed/git-thread/var/log/kea.log"
                    }
                ], 
                "severity": "DEBUG"
            }
        ], 
        "multi-threading": {
            "enable-multi-threading": true, 
            "packet-queue-size": 16, 
            "thread-pool-size": 2
        }, 
        "option-data": [], 
        "rebind-timer": 2000, 
        "renew-timer": 1000, 
        "reservations": [
            {
                "client-classes": [
                    "super-fun-clients"
                ], 
                "hw-address": "aa:bb:cc:dd:ee:ff"
            }
        ], 
        "shared-networks": [], 
        "subnet4": [
            {
                "interface": "enp0s9", 
                "pools": [
                    {
                        "pool": "10.0.0.1-10.0.0.11", 
                        "require-client-classes": [
                            "super-fun-clients"
                        ]
                    }, 
                    {
                        "pool": "10.0.0.15-10.0.0.25"
                    }
                ], 
                "reservation-mode": "global", 
                "subnet": "10.0.0.0/24"
            }
        ], 
        "valid-lifetime": 4000
    }
}

am I making a mistake or is it a bug or pool selection is not possible this way?

EDIT: and packets are classified correctly, pkt with mac address "aa:bb:cc:dd:ee:ff" is assigned to super-fun-clients class

DHCP4_CLASS_ASSIGNED [hwtype=1 aa:bb:cc:dd:ee:ff], cid=[no info], tid=0x3eaf28: client packet has been assigned to the following class(es): ALL, super-fun-clients, KNOWN