Upgraded from Portal 5.2 to Portal 5.2.1.
When create/edit the API policy some and go to Management Permissions --> Managing Organization
the organizations are not getting listed.However, when we create Application we see the Organizations are listed so this issue is only for API policies.
API Portal 5.2.1
Portal 5.2.1 , was added type search for the users if the orgs are more than 50.
On current version 5.2.1 by design Dev Team have added type search for the users if the orgs are more than 50. So the behavior you are observing is not a bug is by design.
Engineering notified the pagination behavior will be fixed on version 5.3.1