DoS Hybrid Defender: VLAN group with one VLAN?

I'm playing with the DoS Hybrid Defender.

I configure (using the DHD Quick Configuration) two VLANs (BIG-IP in L3 mode) with a self IP on each of the VLANs (e.g.: VLAN1 -- 10.1.0.1/24 and VLAN2 -- 10.2.0.1/24). The DHD then not only creates the two expected VLANs (as VL_VLAN1 and VL_VLAN2), but it also creates (unexpectedly) two VLAN groups:

net vlan-group /Common/VLAN1 {
  members {
    /Common/VL_VLAN1
  }
}

net vlan-group /Common/VLAN2 {
  members {
    /Common/VL_VLAN2
  }
}

What would be the reason for creating these VLAN groups (with only a single VLAN in each group)?