structuredAttrs is enabled

trying https://registry.npmjs.org/prosemirror-collab/-/prosemirror-collab-1.3.1.tgz
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100   8730 100   8730   0      0 143.6k      0                              0