Appears to be working in Firefox but at least Chrome & Safari are broken. Should be a really recent regression so very few possible changes to blame...

Easiest repo: the todo list on our homepage.

var parentInfo;
      if (nativeParent != null) {
        parentInfo = nativeParent._ancestorInfo;
      } else if (nativeContainerInfo._tag) {
        parentInfo = nativeContainerInfo._ancestorInfo;
      }
      if (parentInfo) {
        
        
        validateDOMNesting(this._tag, this, parentInfo);
      }
      this._ancestorInfo =
        validateDOMNesting.updatedAncestorInfo(parentInfo, this._tag, this);
    }
    var mountImage;
    if (transaction.useCreateElement) {
      var ownerDocument = nativeContainerInfo._ownerDocument;
      var el;
      if (namespaceURI === DOMNamespaces.html) {
        if (this._tag === 'script') {
          
          
          var div = ownerDocument.createElement('div');
          var type = this._currentElement.type;
          div.innerHTML = `<${type}></${type}>`;
          el = div.removeChild(div.firstChild);
        } else {
          el = ownerDocument.createElement(this._currentElement.type);
        }
      } else {