diff --git a/core/lib/Preview/PreviewManager.php b/core/lib/Preview/PreviewManager.php
index a90d82e..f602c99 100644
--- a/core/lib/Preview/PreviewManager.php
+++ b/core/lib/Preview/PreviewManager.php
@@ -201,6 +201,7 @@ final readonly class PreviewManager
         }
 
         $canonical = json_encode([
+            'version' => 2, // Regenerate previews with opaque document pages and outlines.
             'tenantId' => $tenantId,
             'source' => [
                 'type' => $source->sourceType,
diff --git a/tests/php/Unit/Preview/PreviewManagerTest.php b/tests/php/Unit/Preview/PreviewManagerTest.php
index 2203d4b..be8a69c 100644
--- a/tests/php/Unit/Preview/PreviewManagerTest.php
+++ b/tests/php/Unit/Preview/PreviewManagerTest.php
@@ -397,6 +397,7 @@ final class PreviewManagerTest extends TestCase
         PreviewRequest $request,
     ): string {
         $canonical = json_encode([
+            'version' => 2,
             'tenantId' => 'tenant-a',
             'source' => [
                 'type' => $source->sourceType,