orderFixed post reorder icon update failing to correctly show sort direction

JammySlayer

[Attempted to post this in bug forum but appear to have failed]

No one appears to be able to tell me of a solution that I've missed in the following link so I assume it's actually a bug.

https://datatables.net/forums/discussion/44097/orderfixed-post-reorder-failing-to-update-class#latest

When using post orderFixed:

orderFixed: {
    post: [1,'asc']
}

When you then reorder that column (on click), it fails to show that the order has been changed to desc.

So in the following example:

http://live.datatables.net/xigadiqi/1/edit

Pressing the "position" column shows the arrow for order direction as asc, despite the data being in desc order.