diff --git a/Inc/adsense-placement.php b/Inc/adsense-placement.php
index d377ec05..5abefd99 100644
--- a/Inc/adsense-placement.php
+++ b/Inc/adsense-placement.php
@@ -240,7 +240,9 @@ function roi_inject_content_ads(string $content): string
         );
         $content = $injector->inject($content);
 
-        $finalContent = $postTopHtml . $content . $postBottomHtml;
+        // DEBUG: Agregar marcador visible para rastrear si el contenido se pierde después del filtro
+        $debugMarker = '<!-- ROI-ADSENSE-DEBUG-MARKER -->';
+        $finalContent = $debugMarker . $postTopHtml . $content . $postBottomHtml . $debugMarker;
         error_log('ROI AdSense Debug: Final injection done. postTop=' . strlen($postTopHtml) . ', postBottom=' . strlen($postBottomHtml) . ', finalLength=' . strlen($finalContent));
         error_log('ROI AdSense Debug: First 200 chars of postTopHtml: ' . substr($postTopHtml, 0, 200));