can.view doesn't render deferred data

Hi All,

I'm facing with the following problem: Let's have a controller which creates and displays a modal edit form.

2. var EditForm = can.Control.extend({
3. defaults: {
4. view: config.templateurl + DASH + "editform.mustache",
5. customerTemplate: "customerTemplate",
6. workloadTemplate: "workloadTemplate",
7. engineerTemplate: "engineerTemplate",
8. priorityTemplate: "priorityTemplate",
9. sourceTemplate: "sourceTemplate",
10. statusTemplate: "statusTemplate",
11. },
13. },{
14. init: function(element, options){
15. var self = this;
16. self.element.append(self.options.view, { assignment: Assignments.findOne({id: options.id),selects: selects, customers: customers, engineers: engineers } );
17. }
18. });

The problem is that the view renders the embedded data (selects, customers, engineers), which already existing, but doesn't render the deferred data (assignment), I get the placeholders, like "__||__" instead.

The deferred data resolved, If I debug the mustache template, I can see it in the scope object.

At last I found the following workaround: 

1. init: function(element, options){
2. var self = this;
3. can.view(self.options.view, { assignment: Assignments.findOne({id: options.id}),selects: selects, customers:customers,                               engineers: engineers })
4. .then(function(frag){ self.element.html(frag); });
5. }

I wonder, why does the first version not working?