With maas 1.8 from the stable PPA (on the server - maas 1.9 client I'm afraid) I see the same result (no ip addresses added after I call claim-sticky-ip-addresses):

$ maas maas devices new hostname=foo mac_addresses=52:54:00:9a:17:24
Success.
Machine-readable output follows:
{
    "macaddress_set": [
        {
            "resource_uri": "/MAAS/api/1.0/nodes/node-921c9e0e-216a-11e5-a4e8-5254009e0724/macs/52%3A54%3A00%3A9a%3A17%3A24/", 
            "mac_address": "52:54:00:9a:17:24"
        }
    ], 
    "zone": {
        "resource_uri": "/MAAS/api/1.0/zones/default/", 
        "name": "default", 
        "description": ""
    }, 
    "parent": null, 
    "ip_addresses": [], 
    "hostname": "foo.maas", 
    "tag_names": [], 
    "owner": "maas-admin", 
    "system_id": "node-921c9e0e-216a-11e5-a4e8-5254009e0724", 
    "resource_uri": "/MAAS/api/1.0/devices/node-921c9e0e-216a-11e5-a4e8-5254009e0724/"
}
michael@UbuntuBox:~$ maas maas device claim-sticky-ip-address node-921c9e0e-216a-11e5-a4e8-5254009e0724
Success.
Machine-readable output follows:
{
    "macaddress_set": [
        {
            "resource_uri": "/MAAS/api/1.0/nodes/node-921c9e0e-216a-11e5-a4e8-5254009e0724/macs/52%3A54%3A00%3A9a%3A17%3A24/", 
            "mac_address": "52:54:00:9a:17:24"
        }
    ], 
    "zone": {
        "resource_uri": "/MAAS/api/1.0/zones/default/", 
        "name": "default", 
        "description": ""
    }, 
    "parent": null, 
    "ip_addresses": [], 
    "hostname": "foo.maas", 
    "tag_names": [], 
    "owner": "maas-admin", 
    "system_id": "node-921c9e0e-216a-11e5-a4e8-5254009e0724", 
    "resource_uri": "/MAAS/api/1.0/devices/node-921c9e0e-216a-11e5-a4e8-5254009e0724/"
}
michael@UbuntuBox:~$ maas maas device claim-sticky-ip-address node-921c9e0e-216a-11e5-a4e8-5254009e0724
Success.
Machine-readable output follows:
{
    "macaddress_set": [
        {
            "resource_uri": "/MAAS/api/1.0/nodes/node-921c9e0e-216a-11e5-a4e8-5254009e0724/macs/52%3A54%3A00%3A9a%3A17%3A24/", 
            "mac_address": "52:54:00:9a:17:24"
        }
    ], 
    "zone": {
        "resource_uri": "/MAAS/api/1.0/zones/default/", 
        "name": "default", 
        "description": ""
    }, 
    "parent": null, 
    "ip_addresses": [], 
    "hostname": "foo.maas", 
    "tag_names": [], 
    "owner": "maas-admin", 
    "system_id": "node-921c9e0e-216a-11e5-a4e8-5254009e0724", 
    "resource_uri": "/MAAS/api/1.0/devices/node-921c9e0e-216a-11e5-a4e8-5254009e0724/"
}
michael@UbuntuBox:~$ maas maas device read  node-921c9e0e-216a-11e5-a4e8-5254009e0724Success.
Machine-readable output follows:
{
    "macaddress_set": [
        {
            "resource_uri": "/MAAS/api/1.0/nodes/node-921c9e0e-216a-11e5-a4e8-5254009e0724/macs/52%3A54%3A00%3A9a%3A17%3A24/", 
            "mac_address": "52:54:00:9a:17:24"
        }
    ], 
    "zone": {
        "resource_uri": "/MAAS/api/1.0/zones/default/", 
        "name": "default", 
        "description": ""
    }, 
    "parent": null, 
    "ip_addresses": [], 
    "hostname": "foo.maas", 
    "tag_names": [], 
    "owner": "maas-admin", 
    "system_id": "node-921c9e0e-216a-11e5-a4e8-5254009e0724", 
    "resource_uri": "/MAAS/api/1.0/devices/node-921c9e0e-216a-11e5-a4e8-5254009e0724/"
}