Hi Craig,
sorry for my delayed answer and thank you for yours. ??
Yes, you are totally right. The recent post on the podcast page is right. But it is not appearing in the feed.
The recent post in the feed is wrong and it is the last regular blog-post I made (with Gutenberg-editor if this is important). All the other posts on my page are custom post types. The other episodes of the podcast are the same kind of this custom post type “places”, which worked out fine until last time.