cluster:group-list still display a node which is down

If we start two nodes (both on the default cluster group by default), and shutdown one of the nodes, cluster:group-list command still mention the stopped node:

karaf@node2> cluster:node-list
ID Host Name Port

• [vostro.local:5702 ] [vostro.local ] [ 5702]

karaf@node2> cluster:group-list
Group Members

• [default ] [vostro.local:5702* vostro.local:5701 ]