When I make a request to the site in question (https://example.com/wp-json/wp/v2/posts) with no additional query parameters all of the content.rendered (post_content) is empty, and the protected value is false.

Is anyone aware of a plugins, hooks, etc that would cause the content not to show in the JSON response body?

The site works no problem, and testing this on his other WP sites work without issue. It’s just this one with no content.rendered data.

See image for any clarity: https://i.imgur.com/Ubsivc3.png