Twenty Nineteen: 'For each article in a feed' option is ignored

[noisysocks]

When using the default Twenty Nineteen theme, the For each article in a feed option does not appear to do anything.

1. Activate the Twenty Nineteen theme
2. Create a post that's more than 55 words long
3. Go to Settings > Reading
4. Change For each article in a feed, show to Summary and click Save Changes
5. Browse to the site's home page
6. Browse to the site's /feed/ page

Expected result: Per ​the documentation, the post should show as truncated to 55 words in both the frontend and in the feed.
Actual result: Only the feed shows the truncated post.

4. Change For each article in a feed, show to 'Full text' and click Save Changes

Expected result: Per ​the documentation, the entire post should appear in both the frontend and in the feed.
Actual result: Only the frontend shows the entire post.

[joyously]

Your expected result is incorrect.
The feed is not controlled by the theme, and the documentation does not indicate that that option affects anything except for the feed.
Also, the feed is cached, so changing the option and looking again will show you the same thing you got before.

[noisysocks]

How can one clear the cached feed?

Thanks for clearing up what the expected result is. The documentation is unclear since it says "This setting also affects what users receive in their RSS subscriptions." (emphasis mine) which, to me, implies that the setting affects both the feed and the frontend.

[joyously]

You have to delete the transient.
The documentation talks about the feed and *also* RSS subscriptions. No mention of front end.

[SergeyBiryukov]

Previously: #22049, #31191.