controllers view shows an inaccurate machine count

There are not 23 machines, but `juju controllers` says that there are:

jenkins@juju-0d10ff-osci-16:~$ juju controllers
Use --refresh flag with this command to see the latest information.

Controller Model User Access Cloud/Region Models Machines HA Version
auto-osci-sv07* - admin superuser serverstack/serverstack 2 23 none 2.3.1

jenkins@juju-0d10ff-osci-16:~$ juju models
Controller: auto-osci-sv07

Model Cloud/Region Status Machines Cores Access Last connection
controller serverstack/serverstack available 1 4 admin just now
default serverstack/serverstack available 0 - admin 9 hours ago

jenkins@juju-0d10ff-osci-16:~$ juju status
ERROR current model for controller auto-osci-sv07 not found
jenkins@juju-0d10ff-osci-16:~$

Using --refresh solved it. But why is this necessary?

(clients) jenkins@juju-0d10ff-osci-16:~/tools/z/charm-test-infra$ juju controllers --refresh
Controller Model User Access Cloud/Region Models Machines HA Version
auto-osci-sv07* - admin superuser serverstack/serverstack 2 1 none 2.3.1

--refresh is necessary as we, by default, do not go back to the server for this information. We actually cache it on the client side for a quick response. --refresh option essentially tells to go to the server (controller) to get this information.

However, we have recently worked on getting model counts more frequently to update the cache for this command.

I'll look into keeping machine count updated more frequently in a similar manner to model counts work.

This bug has not been updated in 2 years, so we're marking it Low importance. If you believe this is incorrect, please update the importance.