Virtual link down when no DR/BDR in transit area?

I have 3 routers connected using addressing below and IOU image i86bi-linux-l3-adventerprisek9-15.2.4M1.b
R1 10.13.13.1<->10.13.13.3 R3 10.23.23.3<->10.23.23.2 R2
R1#sh ip int br | ex un
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 10.13.13.1 YES manual up up
Loopback0 1.1.1.1 YES manual up up
R1#sh ip int br | ex un
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 10.13.13.1 YES manual up up
Loopback0 1.1.1.1 YES manual up up
R1#sh ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
3.3.3.3 1 FULL/BDR 00:00:36 10.13.13.3 Ethernet0/0
R1#sh ip ospf int br
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Et0/0 1 0 10.13.13.1/24 10 DR 1/1
R2#sh ip int br | ex un
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 10.23.23.2 YES manual up up
Loopback0 2.2.2.2 YES manual up up
R2#sh ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
3.3.3.3 0 FULL/ - - 10.23.23.3 OSPF_VL0
3.3.3.3 1 FULL/BDR 00:00:39 10.23.23.3 Ethernet0/0
R2#sh ip ospf int br
Interface PID Area IP Address/Mask Cost State Nbrs F/C
VL0 1 0 10.23.23.2/24 10 P2P 1/1
Et0/0 1 1 10.23.23.2/24 10 DR 1/1
Lo0 1 2 2.2.2.2/24 1 LOOP 0/0
R3#sh ip int br | ex un
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 10.13.13.3 YES manual up up
Ethernet0/1 10.23.23.3 YES manual up up
Loopback0 3.3.3.3 YES manual up up
R3#sh ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
2.2.2.2 0 FULL/ - - 10.23.23.2 OSPF_VL0
1.1.1.1 1 FULL/DR 00:00:39 10.13.13.1 Ethernet0/0
2.2.2.2 1 FULL/DR 00:00:36 10.23.23.2 Ethernet0/1
R3#sh ip ospf int br
Interface PID Area IP Address/Mask Cost State Nbrs F/C
VL0 1 0 10.23.23.3/24 10 P2P 1/1
Et0/0 1 0 10.13.13.3/24 10 BDR 1/1
Et0/1 1 1 10.23.23.3/24 10 BDR 1/1
I setup ethernet interfaces between R1 and R3 in ospf area 0 , ethernet interfaces between R2 and R3 in ospf area 1, and loopback interface of R2 in area 2. Then I created virtual link over area 1
Virtual link is up over area 1:
R3#sh ip ospf virtual-links
Virtual Link OSPF_VL0 to router 2.2.2.2 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 1, via interface Ethernet0/1
Topology-MTID Cost Disabled Shutdown Topology Name
0 10 no no Base
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:00
Adjacency State FULL (Hello suppressed)
Index 2/3, retransmission queue length 0, number of retransmission 0
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum is 0 msec
R2#sh ip ospf virtual-links
Virtual Link OSPF_VL0 to router 3.3.3.3 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 1, via interface Ethernet0/0
Topology-MTID Cost Disabled Shutdown Topology Name
0 10 no no Base
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:09
Adjacency State FULL (Hello suppressed)
Index 1/2, retransmission queue length 0, number of retransmission 0
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum is 0 msec

But once DR/BDR removed virtual link is down , why ?
R3(config)#int e0/1
R3(config-if)#ip ospf priority 0
R2(config-if)#int e0/0
R2(config-if)#ip ospf priority 0

R3#
%OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on OSPF_VL0 from FULL to DOWN, Neighbor Down: Interface down or detached

R3#sh ip ospf virtual-links
Virtual Link OSPF_VL0 to router 2.2.2.2 is down
Run as demand circuit
DoNotAge LSA allowed.
Transit area 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 65535 no no Base
Transmit Delay is 1 sec, State DOWN,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

R3#sh ver | i image
System image file is "unix:/tmp/iou/lab_17/dev_3/i86bi-linux-l3-adventerprisek9-15.2.4M1.b"

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