Problem with search , Release Preview

Question

Hi! 

I got a problem with a search contract .

I tested by created new project > grid app .

Then add search .

After added, I can search in Charm. It query the right text that I typed, and show the right search result.

but the problem is when I click any result , it navigated me to the 1st item index every time.

So, I try to debug and found that when I navigated item.data in search.js , the item.data is undefined .

Here are an example 

In Iteminvoked function .

var idx = Data.items.indexOf(item.data, 0); // item.data is undefined , item.Data is also undefined .
nav.navigate("/pages/itemDetail/itemDetail.html", { 
group: item.data.group, selectedIndex: idx });

// nav.navigate("/pages/itemDetail/itemDetail.html", {item.data,0}); // this's not worked cuz item.data is undefined

What should I do ??

Thanks