structuredAttrs is enabled

trying https://registry.npmjs.org/@tiptap/extension-heading/-/extension-heading-3.20.4.tgz
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100   5437 100   5437   0      0  21441      0                              0