OpenShift Container Platform command-line interface (CLI) do not save login credentials as expected

Issue

• It is not possible to log into multiple OCP clusters with the same username using the OCP 4 CLI without having to re-enter credentials every time.

  $ oc login -u user https://openshift.cluster.one:443
  Authentication required for https://openshift.cluster.one:443 (openshift)
  Username: user
  Password: 
  Login successful.
  
  $ oc login -u user https://openshift.cluster.one:443
  Logged into https://openshift.cluster.one:443" as "user" using existing credentials
  
  $ oc login -u user https://openshift.cluster.two:443
  Authentication required for https://openshift.cluster.two:443 (openshift)
  Username: user
  Password: 
  Login successful.
  
  $ oc login -u user https://openshift.cluster.one:443
  Authentication required for https://openshift.cluster.one:443 (openshift)
  Username: user
  Password: 
  Login successful.
  

• It is expected that the last command logs a user in without them having to re-enter their credentials. This used to be the case with earlier versions of the OCP client.