If you are a podcast publisher, here is how to manage your podcast on Google Podcasts
Update all your feeds when making additions, updates, or removals. Only the served feed is used by Google but Google can change the served feed without notice.
Related topics:
Managing podcasts
Google Podcasts checks known feeds several times a day for updates, but changes can take some time to propagate to Google Podcasts platforms. You can check the last time Google saw your feed. If you have an important update, you can request a recrawl of your feed.