A promise object's then method does not return the original target object's properties.

[flowersinthesand]

To reproduce the problem.

1. Prepare a plain target object having specific property.
2. Make a deferred object and a promise object with the target object using the deferred object.
3. Call the then method of the promise object
4. Check if the returned object has that specific property.

Here is jsfiddle.  http://jsfiddle.net/Lbruk/

[jaubourg]

then is now implemented like pipe, so it returns a new promise: http://bugs.jquery.com/ticket/11010

Use done, fail and progress for chaining, they will work as usual.