The client-side setter for EnableDragAndDrop still lets the user drag tiles, even though the other tiles are not reordered, and releasing the tile puts it back in its original place. Dragging should not be available at all.
Closed as duplicate of https://feedback.telerik.com/Project/108/Feedback/Details/125717-fix-radlivetile-throws-a-javascript-error-after-being-disposed-in-a-partial-postb