Header not displayed when .crp-list-title is styled

Not sure what causes this, but if I choose to add a style definition for .crp-list-title, the title isn’t actually displayed.

I’ve tried adding it “inline” (in YARPP’s CSS box), and I’ve tried adding to the custom CSS of the site (using GeneratePress theme). As soon as the CSS class is present, the content of “title” in the shortcode isn’t inserted anywhere.

If I remove the definition of .crp-list-title, whatever I have in the “title” attribute of the shortcode is properly displayed.

This is with WordPress 5.9.3