如下面消息，收到连续2条disconnected，disconnected_at时间不一样，但是connected_at是一样的。正常吗？什么情况下出现这种情况？和clean_start = false 有关系吗？
{““ipaddress"“:”“192.168.11.179"”,““disconnected_at””:1716866900905,““sockport””:9779,““connected_at””:1716863831268,““proto_ver””:4,““proto_name””:““MQTT””,““clientid””:““AAC1142186BUYC””,““username””:““AAC1142186BUYC””,““ts””:1716866900905,““protocol””:““mqtt””,““reason””:““tcp_closed””,““status””:““disconnected””,““node””:""emqx2@192.168.2.8"”,”“topic”“:”“$SYS/brokers/emqx2@192.168.2.8/clients/AAC1142186BUYC/disconnected”"}
{““ipaddress"“:”“192.168.11.179"”,““disconnected_at””:1716867985406,““sockport””:9779,““connected_at””:1716863831268,““proto_ver””:4,““proto_name””:““MQTT””,““clientid””:““AAC1142186BUYC””,““username””:““AAC1142186BUYC””,““ts””:1716867985406,““protocol””:““mqtt””,““reason””:““takenover””,““status””:““disconnected””,““node””:""emqx2@192.168.2.8"”,”“topic”“:”“$SYS/brokers/emqx2@192.168.2.8/clients/AAC1142186BUYC/disconnected”"}
{““ipaddress"“:”“192.168.7.184"”,““expiry_interval””:7200000,““clean_start””:false,““sockport””:9779,““connected_at””:1716867985406,““proto_ver””:4,““proto_name””:““MQTT””,““clientid””:““AAC1142186BUYC””,““username””:““AAC1142186BUYC””,““ts””:1716867985407,““protocol””:““mqtt””,““keepalive””:30,““status””:““connected””,““node””:""emqx2@192.168.2.8"”,”“topic”“:”“$SYS/brokers/emqx2@192.168.2.8/clients/AAC1142186BUYC/connected”"}
