Noticed constant polling of the manifest task even after the manifest was uploaded. The status bar was still empty:

17:11:23 rails.1   | 2019-11-12T17:11:23 [I|app|7edcc52a] Started GET "/foreman_tasks/api/tasks?search=action~organization+%27Default+Organization%27+and+result%3Dpending+and+label%3DActions::Katello::Organization::ManifestImport+or+Actions::Katello::Organization::ManifestRefresh+or+Actions::Katello::Organization::ManifestDelete+or+Actions::Katello::UpstreamSubscriptions::BindEntitlements+or+Actions::Katello::UpstreamSubscriptions::UpdateEntitlement+or+Actions::Katello::UpstreamSubscriptions::RemoveEntitlements+or+Actions::Katello::UpstreamSubscriptions::UpdateEntitlements" for 192.168.122.1 at 2019-11-12 17:11:23 +0000
17:11:23 rails.1   | 2019-11-12T17:11:23 [I|app|7edcc52a] Processing by ForemanTasks::Api::TasksController#index as JSON
17:11:23 rails.1   | 2019-11-12T17:11:23 [I|app|7edcc52a]   Parameters: {"search"=>"action~organization 'Default Organization' and result=pending and label=Actions::Katello::Organization::ManifestImport or Actions::Katello::Organization::ManifestRefresh or Actions::Katello::Organization::ManifestDelete or Actions::Katello::UpstreamSubscriptions::BindEntitlements or Actions::Katello::UpstreamSubscriptions::UpdateEntitlement or Actions::Katello::UpstreamSubscriptions::RemoveEntitlements or Actions::Katello::UpstreamSubscriptions::UpdateEntitlements"}
17:11:23 rails.1   | 2019-11-12T17:11:23 [D|app|7edcc52a] Body: {"total":19,"subtotal":0,"page":1,"per_page":20,"sort":{"by":"started_at","order":"DESC"},"results":[]}
17:11:23 rails.1   | 2019-11-12T17:11:23 [I|app|7edcc52a] Completed 200 OK in 21ms (Views: 0.3ms | ActiveRecord: 4.8ms)

Issue appears to occur because

action

katello/webpack/scenes/Tasks/TaskActions.js:pollTaskUntilDone

This is looking like it was caused by a change in the Foreman React code since the bug exists with Foreman 1.24 + Katello 3.13 but not with Foreman 1.23 + Katello 3.13. This community post explains in more detail: https://community.theforeman.org/t/change-in-foreman-react-code-affecting-katello-manifest-refresh-ui/16184