group state carries two leader

[w41ter]

2022-08-22T11:14:17.355427Z TRACE engula_client::router: update event; group state GroupState { group_id: 100001, leader_id: Some(1000012), replicas: [ReplicaState { replica_id: 1000010, group_id: 100001, term: 3, voted_for: 1000010, role: Leader, node_id: 0 }, ReplicaState { replica_id: 1000011, group_id: 100001, term: 3, voted_for: 1000010, role: Follower, node_id: 1 }, ReplicaState { replica_id: 1000012, group_id: 100001, term: 2, voted_for: 1000012, role: Leader, node_id: 2 }] }       
2022-08-22T11:14:17.393537Z TRACE engula_client::router: update event; group state GroupState { group_id: 100001, leader_id: Some(1000012), replicas: [ReplicaState { replica_id: 1000010, group_id: 100001, term: 3, voted_for: 1000010, role: Leader, node_id: 0 }, ReplicaState { replica_id: 1000011, group_id: 100001, term: 3, voted_for: 1000010, role: Follower, node_id: 1 }, ReplicaState { replica_id: 1000012, group_id: 100001, term: 2, voted_for: 1000012, role: Leader, node_id: 2 }] }
2022-08-22T11:14:17.397597Z TRACE engula_client::router: update event; group state GroupState { group_id: 100001, leader_id: Some(1000012), replicas: [ReplicaState { replica_id: 1000010, group_id: 100001, term: 3, voted_for: 1000010, role: Leader, node_id: 0 }, ReplicaState { replica_id: 1000011, group_id: 100001, term: 3, voted_for: 1000010, role: Follower, node_id: 1 }, ReplicaState { replica_id: 1000012, group_id: 100001, term: 2, voted_for: 1000012, role: Leader, node_id: 2 }] }        

The group 100001 has two members who claim that it is the leader:

• ReplicaState { replica_id: 1000010, group_id: 100001, term: 3, voted_for: 1000010, role: Leader, node_id: 0 }
• ReplicaState { replica_id: 1000012, group_id: 100001, term: 2, voted_for: 1000012, role: Leader, node_id: 2 }

It is obviously that the replica 1000010 is the actually leader of this group, since it's term 3 is large than replica 1000012's 2. But the leader_id of GroupState is Some(1000012).