Does Planner support never ending recurring meetings from outlook?

No. It is bad practice to have never-ending recurring meetings. It especially creates issues if the host changes jobs and is no longer available to edit or delete the recurrence. We recommend that you disable never-ending recurring meetings in Outlook. This link explains more about why it's bad practice and how to disable never-ending recurring meetings in Outlook https://www.slipstick.com/outlook/calendar/encourage-users-to-set-end-date-on-recurring-appointments/