RSS feed limit

This is answered clearly in the plugin documentation: https://docs.hughlashbrooke.com/document/why-do-i-only-see-x-episodes-in-my-podcast-rss-feed/

This works for /feed/podcast/ but not for /podcast/feed/

Is there any way to make it work for both?

Why would you want to use /podcast/feed – it does not contain any of the podcast episode data that is required for iTunes and other podcasting services.

That being said, if you simply edit the setting for ‘Syndication feeds show the most recent X items’ in your WordPress Reading settings (Settings > Reading) then it will make the changes on all of your site’s RSS feeds.