There is a "wrong" redirecting after clicking on _Add_ or _Cancel_ button,for actions as adding/removing Host from Host Aggregate, editing selected Host Aggregate: we end up in a different controller to where we were before providing the action, different breadcrumbs, title etc.
Also if there are no Hosts available to be added or removed from selected Host Aggregate displayed through provider's summary, we end up in the list of providers!
See also the comment.
Steps:
host-aggregate, not the original one - ems_cloud)Actual result:
After clicking on _Add_: (textual summary)

After clicking on _Cancel_: (list view)

Expected result: (no matter if clicking on _Add_ or _Cancel_)

@hstastna was this already fixed in a PR?
I don't see any PR associated with this issue, so I would say: no, it is not fixed. But maybe somebody fixed that together with some other issue. I will test once I fix my problems with my developer setup, because I cannot test it right now due to the problems I have.
Note that I've checked this and the issue is still actual.
WIP PR regarding the issue: https://github.com/ManageIQ/manageiq-ui-classic/pull/6649