diff --git a/Public/YoutubeFacade/Infrastructure/Services/YoutubeFacadeContentFilter.php b/Public/YoutubeFacade/Infrastructure/Services/YoutubeFacadeContentFilter.php
index 915a72aa..487b0a61 100644
--- a/Public/YoutubeFacade/Infrastructure/Services/YoutubeFacadeContentFilter.php
+++ b/Public/YoutubeFacade/Infrastructure/Services/YoutubeFacadeContentFilter.php
@@ -32,23 +32,35 @@ final class YoutubeFacadeContentFilter
      */
     public function filter(string $content): string
     {
+        // DEBUG: Log that filter is being called
+        error_log('YoutubeFacade: filter() called, content length: ' . strlen($content));
+
         // Check if content has YouTube embeds at all (quick check)
         if (strpos($content, 'youtube.com/embed/') === false && strpos($content, 'youtube-nocookie.com/embed/') === false) {
+            error_log('YoutubeFacade: No YouTube embeds found in quick check');
             return $content;
         }
 
+        error_log('YoutubeFacade: YouTube embed detected, applying regex');
+
         // Pattern to match YouTube iframes
         // Handles: youtube.com/embed/ and youtube-nocookie.com/embed/
         // More flexible: allows any attributes in any order, whitespace variations
         $pattern = '/<iframe\s+[^>]*src=["\']https?:\/\/(?:www\.)?(?:youtube\.com|youtube-nocookie\.com)\/embed\/([a-zA-Z0-9_-]+)[^"\']*["\'][^>]*>\s*<\/iframe>/is';
 
-        $result = preg_replace_callback($pattern, function ($matches) {
+        $matchCount = 0;
+        $result = preg_replace_callback($pattern, function ($matches) use (&$matchCount) {
+            $matchCount++;
             $videoId = $matches[1];
+            error_log('YoutubeFacade: Matched video ID: ' . $videoId);
             return $this->renderer->render($videoId);
         }, $content);
 
+        error_log('YoutubeFacade: Regex replaced ' . $matchCount . ' iframes');
+
         // Return original content if regex failed
         if ($result === null) {
+            error_log('YoutubeFacade: preg_replace_callback returned null (regex error)');
             return $content;
         }