fix: add missing option_home filter + flush rewrite rules on site duplication

inc/class-domain-mapping.php

@@ -491,6 +491,7 @@ public function register_mapped_filters(): void {
 		add_filter('site_url', [$this, 'mangle_url'], -10, 4);
 		add_filter('home_url', [$this, 'mangle_url'], -10, 4);
 		add_filter('option_siteurl', [$this, 'mangle_url'], 20);
+		add_filter('option_home', [$this, 'mangle_url'], 20);
 
 		add_filter('theme_file_uri', [$this, 'mangle_url']);
 		add_filter('stylesheet_directory_uri', [$this, 'mangle_url']);

inc/compat/class-general-compat.php

@@ -129,6 +129,17 @@ public function init(): void {
 		 */
 		add_filter('wp_initialize_site_args', [$this, 'fix_new_site_url_scheme'], 10, 3);
 
+		/**
+		 * Flush rewrite rules after site duplication.
+		 *
+		 * Cloned sites inherit the template's rewrite_rules option verbatim.
+		 * If CPT permalink slugs were changed after the template was created,
+		 * the cloned site will 404 on those CPT URLs until rules are regenerated.
+		 *
+		 * @since 2.0.24
+		 */
+		add_action('wu_duplicate_site', [$this, 'flush_rewrite_rules_on_new_site'], 20);
+
 		/**
 		 * Rank Math (Free and Pro)
 		 *
@@ -501,6 +512,32 @@ public function fix_new_site_url_scheme(array $args, \WP_Site $site, \WP_Network
 		return $args;
 	}
 
+	/**
+	 * Flush rewrite rules after site duplication.
+	 *
+	 * Cloned sites inherit the template's rewrite_rules option verbatim.
+	 * If CPT permalink slugs were changed after the template was created,
+	 * the cloned site will 404 on those CPT URLs until rules are regenerated.
+	 *
+	 * @since 2.0.24
+	 * @param int|object $new_site The new site ID or data object.
+	 * @return void
+	 */
+	public function flush_rewrite_rules_on_new_site($new_site): void {
+
+		$blog_id = is_object($new_site) && isset($new_site->blog_id)
+			? (int) $new_site->blog_id
+			: (int) $new_site;
+
+		if ($blog_id < 2) {
+			return;
+		}
+
+		switch_to_blog($blog_id);
+		flush_rewrite_rules(true);
+		restore_current_blog();
+	}
+
 	/**
 	 * Removes RankMath and RankMath Pro Installer::wpmu_new_blog action
 	 * This registered action causes error on database during site creation