Fix `original_url` in playlists

yt_dlp/YoutubeDL.py

@@ -1626,8 +1626,8 @@ class YoutubeDL:
         if result_type in ('url', 'url_transparent'):
             ie_result['url'] = sanitize_url(
                 ie_result['url'], scheme='http' if self.params.get('prefer_insecure') else 'https')
-            if ie_result.get('original_url'):
+            if ie_result.get('original_url') and not extra_info.get('original_url'):
-                extra_info.setdefault('original_url', ie_result['original_url'])
+                extra_info = {'original_url': ie_result['original_url'], **extra_info}
 
             extract_flat = self.params.get('extract_flat', False)
             if ((extract_flat == 'in_playlist' and 'playlist' in extra_info)