QinQ stacking "ignoring" pe-vid on vsi - S6720 switch

I have an MPLS network working with 3 routers, but I noticed recently that the subif is "ignoring" the pe-vid configution on the qinq stackings I have configured on the switches.

I have the vlan 2001 in both ports with the configuration like this:

vsi lajeado static

 pwsignal ldp

  vsi-id 12

  peer 172.30.1.2

 mtu 9216

#

interface XGigabitEthernet0/0/20

 port link-type trunk

 port trunk allow-pass vlan 12

#

interface XGigabitEthernet0/0/20.1

 qinq stacking vid 2001 pe-vid 13

 l2 binding vsi lajeado

#

interface XGigabitEthernet0/0/24

 description ROUTER_TAIPEI

 port link-type trunk

 port trunk allow-pass vlan 4 1204

#

interface XGigabitEthernet0/0/24.1

 qinq stacking vid 2001 pe-vid 12

 l2 binding vsi lajeado #

When I believe it shouldn't, because there are two differents pe-vids configured on each port, right?

What I want to achieve is separate vlan from a port into different qinq vlans, so I can isolate them.

What am I doind wrong?

Thanks in regards.