--- ContentObjectRenderer.php	2020-04-25 11:58:11.311908520 +0200
+++ ContentObjectRenderer.patched.php	2020-04-25 11:56:31.300926021 +0200
@@ -3932,7 +3932,7 @@
                     // call this method recursively if found
                     if (strpos($data, '<') !== false) {
                         foreach ($conf['tags.'] as $tag => $tagConfig) {
-                            if (strpos($data, '<' . $tag) !== false) {
+                            if (preg_match('#<' . $tag.'[\s/>]#', $data)) {
                                 $data = $this->_parseFunc($data, $conf);
                                 break;
                             }
@@ -7113,7 +7113,7 @@
         // Take care for nested tags
         do {
             $nextMatchingEndTagPosition = strpos($tempContent, $endTag);
-            $nextSameTypeTagPosition = strpos($tempContent, $startTag);
+            $nextSameTypeTagPosition = preg_match('#'.$startTag.'[\s/>]#', $tempContent, $nextSameStartTagMatches, PREG_OFFSET_CAPTURE) ? $nextSameStartTagMatches[0][1] : false;
 
             // filter out nested tag contents to help getting the correct closing tag
             if ($nextSameTypeTagPosition !== false && $nextSameTypeTagPosition < $nextMatchingEndTagPosition) {