jQuery UI 1.12.0 Beta 1 Draggable bug?

jQuery UI 1.12.0 Beta 1 Draggable bug?

In a fixed (or absolute) positioned element with either "bottom" and/or "right" styles set, Draggable does not work. It gets resized rather than being dragged. (tested on Win7/OSX/Chrome 47/Firefox). This works as expected on 1.11.4 but not in 1.12.0 Beta 1.

Sample code:
<!doctype html>                                                                
<html lang="en">                                                               
<head>                                                                         
<script>                                                                       
$(function() {                                                                 
  $( "#draggable" ).draggable();                                               
});                                                                            
</script>                                                                      
</head>                                                                        
<body>                                                                         
<div style="position:fixed;bottom:0;right:0" id="draggable" class="ui-widget-content">                                                                        
  <p>Drag me around</p>                                                        
</div>                                                                         
</body>                                                                        
</html>