Phone in both VoiP and Data VLANs

I am using Juniper ex4200-48p running JUNOS Base OS boot [12.3R6.6]

I have a dot1x environment, using Cisco ISE
All my ports are under dot1x control (via Cisco ISE) and are working as expected
However I need to temporarily turn dot1x off

I am testing on a port and I have removed it from my Cisco ISE interface group
The test port is as follows

edit interfaces ge-2/0/17 unit 0]
simon.young@BOH2-NET-SWA401# show
family ethernet-switching {
    port-mode access;
    vlan {
        members DATA;
    }
}

# show
voip {
    interface access-ports {
        vlan VoIP;
    }
}
storm-control {
    interface all;
}

The Mitel phone (08:00:0f:bf:9a:84) appears on both VLANs and does not age out of the DATA VLAN

{master:0}[edit ethernet-switching-options]
simon.young@BOH2-NET-SWA401# run show ethernet-switching table interface ge-2/0/17.0
Ethernet-switching table: 3 unicast entries
  VLAN              MAC address       Type         Age Interfaces
  CMS               *                 Flood          - All-members
  DATA               08:00:0f:bf:9a:84 Learn          0 ge-2/0/17.0
  DATA             a4:4c:c8:56:ee:3b Learn          0 ge-2/0/17.0
  VoIP              *                 Flood          - All-members
  VoIP              08:00:0f:bf:9a:84 Learn          0 ge-2/0/17.0

{master:0}[edit ethernet-switching-options]

The phone works but I am concerned that it appears in both VLANs? I convinced this will cause me issues?