diff --git a/includes/engine/class-tmdo-entity-migration-engine.php b/includes/engine/class-tmdo-entity-migration-engine.php
index 39cb1a9..cdf6308 100644
--- a/includes/engine/class-tmdo-entity-migration-engine.php
+++ b/includes/engine/class-tmdo-entity-migration-engine.php
@@ -176,6 +176,9 @@ final class TMDO_Entity_Migration_Engine {
 		// 標記完成
 		if ( ! $options['dry_run'] ) {
 			self::mark_migration_completed( $entity_type, $group_name );
+			if ( $stats['migrated'] > 0 ) {
+				self::counts_changed( $entity_type );
+			}
 		}
 
 		$stats['elapsed_sec'] = round( microtime( true ) - $start_time, 2 );
@@ -183,6 +186,19 @@ final class TMDO_Entity_Migration_Engine {
 		return $stats;
 	}
 
+	/**
+	 * Rows rebuilt outside the Hook Bus (backfill, drift-check --fix): routed
+	 * post counts cached for the old rows are stale (2.4 PR-129).
+	 *
+	 * @param string $entity_type Entity type.
+	 * @return void
+	 */
+	private static function counts_changed( string $entity_type ): void {
+		if ( 'post' === $entity_type && class_exists( 'TMDO_Post_Query_Router' ) ) {
+			TMDO_Post_Query_Router::bump_count_version();
+		}
+	}
+
 	/**
 	 * Rebuild one entity's row of a group from native meta.
 	 *
@@ -194,7 +210,7 @@ final class TMDO_Entity_Migration_Engine {
 		if ( ! $adapter || empty( $group_fields ) ) {
 			return false;
 		}
-		return self::migrate_single_entity(
+		$migrated = self::migrate_single_entity(
 			$entity_type,
 			$group_name,
 			$entity_id,
@@ -203,6 +219,10 @@ final class TMDO_Entity_Migration_Engine {
 			$adapter,
 			false
 		);
+		if ( $migrated ) {
+			self::counts_changed( $entity_type );
+		}
+		return $migrated;
 	}
 
 	/**
@@ -409,6 +429,9 @@ final class TMDO_Entity_Migration_Engine {
 
 		$total = $prev_total + $batch_migrated;
 		$done  = count( $entity_ids ) < $batch_size;
+		if ( $batch_migrated > 0 ) {
+			self::counts_changed( $entity_type );
+		}
 
 		if ( $done ) {
 			self::mark_migration_completed( $entity_type, $group_name );
diff --git a/tests/integration/PostStatusSyncTest.php b/tests/integration/PostStatusSyncTest.php
index fb85738..3aaf18f 100644
--- a/tests/integration/PostStatusSyncTest.php
+++ b/tests/integration/PostStatusSyncTest.php
@@ -26,6 +26,8 @@ class PostStatusSyncTest extends TestCase {
 			'includes/engine/class-tmdo-hook-bus.php',
 			'includes/engine/class-tmdo-post-status-sync.php',
 			'includes/engine/class-tmdo-entity-migration-engine.php',
+			'includes/integrations/class-tmdo-post-fields.php',
+			'includes/query/class-tmdo-post-query-router.php',
 		) as $file ) {
 			require_once $base . $file;
 		}
@@ -223,6 +225,40 @@ class PostStatusSyncTest extends TestCase {
 		$this->assertSame( array( 'pending', '2026-03-01 10:00:00' ), $this->copies( self::A )[3] );
 	}
 
+	/**
+	 * Backfills and drift-check --fix rebuild rows outside the Hook Bus: the
+	 * routed counts cached for the old rows must go (2.4 PR-129; dev36: a
+	 * vendor search kept counting 21515 of 21522 matches after a fix).
+	 */
+	public function test_rebuilding_post_rows_invalidates_cached_routed_counts(): void {
+		global $wpdb;
+		$status = $wpdb->prefix . TMDO_TABLE_PREFIX . 'migration_status';
+		$wpdb->query( "CREATE TABLE IF NOT EXISTS `{$wpdb->postmeta}` ( meta_id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT, post_id BIGINT UNSIGNED NOT NULL DEFAULT 0, meta_key VARCHAR(255) DEFAULT NULL, meta_value LONGTEXT, PRIMARY KEY (meta_id) ) ENGINE=InnoDB" );
+		$wpdb->query( "CREATE TABLE IF NOT EXISTS `{$status}` ( id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT, entity_type VARCHAR(50) NOT NULL, group_name VARCHAR(50) NOT NULL, last_id BIGINT UNSIGNED NOT NULL DEFAULT 0, total_migrated BIGINT UNSIGNED NOT NULL DEFAULT 0, status VARCHAR(20) NOT NULL DEFAULT 'pending', started_at DATETIME DEFAULT NULL, completed_at DATETIME DEFAULT NULL, PRIMARY KEY (id), UNIQUE KEY entity_group (entity_type, group_name) ) ENGINE=InnoDB" );
+		$version = static fn() => $GLOBALS['_wp_last_changed'][ TMDO_Post_Query_Router::COUNT_VERSION_GROUP ] ?? null;
+		try {
+			$wpdb->query( "INSERT INTO `{$wpdb->postmeta}` (post_id, meta_key, meta_value) VALUES (2, 'k', 'a2-native')" );
+
+			$GLOBALS['_wp_last_changed'][ TMDO_Post_Query_Router::COUNT_VERSION_GROUP ] = 'before';
+			TMDO_Entity_Migration_Engine::migrate_group( 'post', 'ps_a', array( 'resume' => false, 'sleep_ms' => 0, 'dry_run' => true ) );
+			$this->assertSame( 'before', $version(), 'a dry run writes nothing' );
+
+			foreach ( array(
+				'migrate_entity'      => static fn() => TMDO_Entity_Migration_Engine::migrate_entity( 'post', 'ps_a', 2 ),
+				'migrate_group'       => static fn() => TMDO_Entity_Migration_Engine::migrate_group( 'post', 'ps_a', array( 'resume' => false, 'sleep_ms' => 0 ) ),
+				'migrate_group_batch' => static fn() => TMDO_Entity_Migration_Engine::migrate_group_batch( 'post', 'ps_a' ),
+			) as $path => $run ) {
+				TMDO_Entity_Migration_Engine::reset_checkpoint( 'post', 'ps_a' );
+				$GLOBALS['_wp_last_changed'][ TMDO_Post_Query_Router::COUNT_VERSION_GROUP ] = 'before';
+				$run();
+				$this->assertNotSame( 'before', $version(), $path );
+			}
+		} finally {
+			$wpdb->query( "DROP TABLE IF EXISTS `{$wpdb->postmeta}`" );
+			$wpdb->query( "DROP TABLE IF EXISTS `{$status}`" );
+		}
+	}
+
 	public function test_flat_write_that_creates_a_row_fills_the_copies(): void {
 		TMDO_Post_Status_Sync::run();
 		$mode = new ReflectionProperty( WPDO_Mode_Manager::class, 'cache' );