Tree not displaying all children when expanding multiple nodes

[TWry]

I need to expand multiple nodes of a tree structure in a dgrid. Those nodes have more than 20 children. When I use the following code, only some of the children of group1 are visible after expansion:

define(['dgrid/OnDemandGrid', 'dgrid/Tree', "dojo/_base/declare", "./Store",
    'dojo/request/xhr', 'put-selector/put', 'dojo/on'],
  function (Grid, Tree, declare, Store, xhr, put, on) {

  var columns = [
    {
      renderExpando: true,
      label: "Group",
      field: "group"
    },
    {
      label: "Name",
      field: "name"
    }
  ];

  var makeGrid = function(data) {
    var url = "/data/data.json";
    var data;
    xhr.get(url, {
        handleAs: "json",
        sync: true
    }).then(function(xhrdata) {
      data = xhrdata;
    });

    var store = new Store({
          data: data,
          idProperty: "id"
    });

    var TreeGrid = declare([Grid, Tree]);
    var grid = new TreeGrid({
      columns: columns,
      collection: store.getRootCollection()
    }, 'dgrid');

    var but = put(document.body, "button", {
      innerHTML: 'expand'
    });

    on(but, 'click', function(){
      grid.expand('group1');
      grid.expand('group2');
    });
  };

  return {
    renderGrid: function(data){
      makeGrid(data);
    }
  };

});

group2, however, is displayed correctly.

Could this be a bug or am I doing something wrong? dgrid version is 0.4.0.

[kfranqueiro]

Firstly, we recently resolved an issue which might have something to do with this, so could you try testing against the current head of the dev-0.4 branch?

If you still experience the issue, would you be able to provide an example of data that helps reproduce the issue?