When a guest opens a Podcast recording invite link in the browser they already joined with, the page shows Continue as their name. It returns them to their place in the session, where they can choose Resume upload for audio that has not finished uploading. Before, opening the link again added them as a second person with no audio.
While a take is waiting for uploads, no one new can join. This applies to guests who join after this change; someone who joined earlier can reopen the session page from their browser history.