--- Html.php.ORI	2022-02-21 13:25:24.424944327 +0100
+++ Html.php	2022-10-12 14:05:00.912891018 +0200
@@ -362,6 +362,16 @@
             $node->setAttribute('style', $style . 'width:auto !important');
             break;
 
+        case 'source':
+            if ($this->_imgBlock() && 
+                $node->hasAttribute('srcset'))
+            {
+                $node->setAttribute(self::SRCSETBLOCK, $node->getAttribute('srcset'));
+                $node->setAttribute('srcset', '');
+                $this->_imptmp['imgblock'] = true;
+                break;
+            }
+
         case 'img':
         case 'input':
             if ($node->hasAttribute('src')) {