Turns out the single-post.php template was missing a call to the_post(). Since that function initializes all the postdata used by functions like the_content(), WordPress had nothing to display.
As for Yoast SEO, I’m guessing it calls the_post() somewhere early on which would populate the WordPress global variables. If the theme was written with Yoast SEO enabled, no one would ever have noticed the omission.
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