i have created pbb subinterface for encapsulating packets with pbb. then i deleted it and try to send another packet. subint was still used and also i still can see xconnect to it. also help for delete subif is not updated (see at the end)

my setup was:
set int ip address GigabitEthernet0/8/0 11.0.1.11/24
set int ip address GigabitEthernet0/a/0 11.0.3.1/24
set int state GigabitEthernet0/8/0 up
set int state GigabitEthernet0/a/0 up

vxlan_add_del_tunnel src 11.0.1.11 dst 11.0.1.111 vni 24

lisp enable
lisp locator-set add ls1 iface GigabitEthernet0/a/0 p 1 w 1
lisp eid-table add eid 11.0.1.0/24 locator-set ls1
lisp map-resolver add 11.0.3.100

tap_connect tapname tap1 mac 01:01:01:aa:aa:aa
tap_connect tapname tap2 mac 02:02:02:aa:aa:aa
sw_interface_set_flags sw_if_index 5 admin-up link-up
sw_interface_set_flags sw_if_index 6 admin-up link-up

create_subif sw_if_index 5 sub_id 11 dot1ah dmac 02:02:02:aa:aa:ab smac 00:50:56:af:ad:63 vlanid 111 sid 666 push
sw_interface_set_l2_xconnect rx_sw_if_index 3 tx_sw_if_index 7

sudo brctl addbr vpp_br
sudo ip addr flush dev tap1
sudo ip addr flush dev tap2
sudo brctl addif vpp_br tap1
sudo brctl addif vpp_br tap2
sudo brctl show
sudo ifconfig vpp_br up
sudo ip addr flush dev vpp_br

for delete:
delete_subif sw_if_index 7

log from vpp after subint deletion:

vpp# sh int
Name Idx State Counter Count
GigabitEthernet0/8/0 1 up rx packets 6
rx bytes 552
ip4 6
GigabitEthernet0/a/0 2 up
lisp_gpe0 4 up
local0 0 down
tap-0 5 up rx packets 11
rx bytes 938
tx packets 5
tx bytes 320
drops 11
punts 8
ip6 11
tap-1 6 up rx packets 16
rx bytes 1258
drops 16
punts 8
ip6 11
vxlan_tunnel0 3 up rx packets 6
rx bytes 252
drops 1
vpp# clear trace
vpp# sh trace
------------------- Start of thread 0 vpp_main -------------------
Packet 1

00:36:45:656851: dpdk-input
GigabitEthernet0/8/0 rx queue 0
buffer 0x4d19: current data 0, length 92, free-list 0, totlen-nifb 0, trace 0x0
PKT MBUF: port 0, nb_segs 1, pkt_len 92
buf_len 2176, data_len 92, ol_flags 0x0, data_off 128, phys_addr 0x736f3700
packet_type 0x0
IP4: 11:11:11:11:11:11 -> 08:00:27:15:8b:91
UDP: 11.0.1.111 -> 11.0.1.11
tos 0x00, ttl 64, length 78, checksum 0x6225
fragment id 0x0001
UDP: 1337 -> 4789
length 58, checksum 0xb181
00:36:45:656881: ethernet-input
IP4: 11:11:11:11:11:11 -> 08:00:27:15:8b:91
00:36:45:656887: ip4-input
UDP: 11.0.1.111 -> 11.0.1.11
tos 0x00, ttl 64, length 78, checksum 0x6225
fragment id 0x0001
UDP: 1337 -> 4789
length 58, checksum 0xb181
00:36:45:656889: ip4-lookup
fib 0 adj-idx 4 : 11.0.1.11/24 flow hash: 0x00000000
UDP: 11.0.1.111 -> 11.0.1.11
tos 0x00, ttl 64, length 78, checksum 0x6225
fragment id 0x0001
UDP: 1337 -> 4789
length 58, checksum 0xb181
00:36:45:656891: ip4-local
UDP: 11.0.1.111 -> 11.0.1.11
tos 0x00, ttl 64, length 78, checksum 0x6225
fragment id 0x0001
UDP: 1337 -> 4789
length 58, checksum 0xb181
00:36:45:656893: ip4-udp-lookup
UDP: src-port 1337 dst-port 4789
00:36:45:656895: vxlan4-input
VXLAN: tunnel 0 vni 24 next 1 error 0
00:36:45:656899: l2-input
l2-input: sw_if_index 3 dst 00:50:56:af:9a:2e src 00:50:56:af:ad:63
00:36:45:656901: l2-output
l2-output: sw_if_index 8 dst 00:50:56:af:9a:2e src 00:50:56:af:ad:63
00:36:45:656902: tap-0-output
tap-0.11
DOT1AH: 00:50:56:af:ad:63 -> 02:02:02:aa:aa:aa
PBB header : B_tag 006F (vid 111, dei 0, pcp 0), I_tag 0000029A (sid 666, res 0, dei 0, pcp 0)

Packet 2

00:36:45:656941: tapcli-rx
tap-1
00:36:45:656948: ethernet-input
DOT1AH: 00:50:56:af:ad:63 -> 02:02:02:aa:aa:aa
PBB header : B_tag 006F (vid 111, dei 0, pcp 0), I_tag 0000029A (sid 666, res 0, dei 0, pcp 0)
00:36:45:656950: error-drop
ethernet-input: unknown vlan

----------------

vpp# sh int addr
GigabitEthernet0/8/0 (up):
11.0.1.11/24
GigabitEthernet0/a/0 (up):
l2 bridge bd_id 10 shg 0
11.0.3.1/24
GigabitEthernet0/a/0.11 (dn):
l2_lisp_gpe111 (up):
l2 bridge bd_id 10 shg 0
lisp_gpe0 (up):
local0 (dn):
tap-0 (up):
tap-1 (up):
vxlan_tunnel0 (up):
l2 xconnect tap-0.11
vpp#

-----------------------------------------

vat# help delete_subif
usage: delete_subif sub_sw_if_index <nn> sub_if_id <nn>

vat# delete_subif sub_sw_if_index 8 sub_if_id 11
missing sw_if_index
delete_subif error: Misc

vat# delete_subif sw_if_index 8

{
"retval": 0
}