- Quickfix on attributes

src/Common/UiElement.php

@@ -292,7 +292,7 @@ class UiElement implements \ArrayAccess, \Iterator, \JsonSerializable {
 
                 default:
                     if ( is_numeric($key) ) {
-                        $this->attributes[] = $value;
+                        $this->attributes[$key] = $value;
                     }
                     elseif ( is_array($this->attributes[$key] ?? false) ) {
                         $this->attributes[$key] = array_replace($value, $this->attributes[$key]);