The question is: Will this be added to XnView again or did the enginge change in a way so TC won't be able to use it anymore? In other word: Would it make sense to request support at the TC team?
even though this might be not a XN-View "Bug" I'd still be interested in your feedback in the following:
I'm using XnView together with Total Commander, since Total Commander has a very nice XnView integration. So it's possible to use the XnView engine as the default viewer in Total Commander ...