fix blog

wp-content/themes/twentytwentyfour/functions.php

@@ -422,6 +422,29 @@ function twentytwentyfour_blog_home_template( $template ) {
 }
 add_filter( 'template_include', 'twentytwentyfour_blog_home_template', 25 );
 
+/**
+ * Force the custom single post template.
+ *
+ * @since Twenty Twenty-Four 1.0
+ *
+ * @param string $template Resolved template path.
+ * @return string
+ */
+function twentytwentyfour_single_post_template( $template ) {
+	if ( ! is_singular( 'post' ) ) {
+		return $template;
+	}
+
+	$custom_template = get_theme_file_path( 'single.php' );
+
+	if ( file_exists( $custom_template ) ) {
+		return $custom_template;
+	}
+
+	return $template;
+}
+add_filter( 'template_include', 'twentytwentyfour_single_post_template', 25 );
+
 /**
  * Enqueue standalone landing assets for the page slug "test1".
  *