Failed to create AddressBlock about coil HOT 2 CLOSED

cybozu@gcp0-boot-0:~$ kubectl get addressblock | grep default
default-0           10.69.0.5     default           10.64.0.0/27
default-1           10.69.0.196   default           10.64.0.32/27
default-2           10.69.1.133   default           10.64.0.64/27
default-3           10.69.0.196   default           10.64.0.96/27
default-4           10.69.0.197   default           10.64.0.128/27
default-5           10.69.1.132   default           10.64.0.160/27
default-6           10.69.0.4     default           10.64.0.192/27
default-7           10.69.1.134   default           10.64.0.224/27

cybozu@gcp0-boot-0:~$ stern -n kube-system coil-controller-
(...)
coil-controller-cc56ff6f-sw5rq coil-controller {"level":"info","ts":1617760489.8024213,"logger":"blockrequest-reconciler","msg":"allocated","blockrequest":"req-default-10.69.1.132","block":"defaul
t-5","index":5,"pool":"default"}
coil-controller-cc56ff6f-sw5rq coil-controller {"level":"info","ts":1617760511.0823762,"logger":"pool-manager","msg":"created AddressBlock","pool":"default","index":6,"node":"10.69.0.4"}
coil-controller-cc56ff6f-sw5rq coil-controller {"level":"info","ts":1617760511.082449,"logger":"blockrequest-reconciler","msg":"allocated","blockrequest":"req-default-10.69.0.4","block":"default-6
","index":6,"pool":"default"}
coil-controller-cc56ff6f-sw5rq coil-controller {"level":"info","ts":1617760603.1189501,"logger":"pool-manager","msg":"created AddressBlock","pool":"default","index":7,"node":"10.69.1.134"}
coil-controller-cc56ff6f-sw5rq coil-controller {"level":"info","ts":1617760603.119075,"logger":"blockrequest-reconciler","msg":"allocated","blockrequest":"req-default-10.69.1.134","block":"default
-7","index":7,"pool":"default"}
coil-controller-cc56ff6f-sw5rq coil-controller {"level":"info","ts":1617760603.1197767,"logger":"pool-manager","msg":"resynced block usage","pool":"default","blocks":7}
coil-controller-cc56ff6f-sw5rq coil-controller {"level":"info","ts":1617760603.1198223,"logger":"addresspool-reconciler","msg":"synchronized"}