So if you perform push into push-stab with the dual daggers, clicking again after that will result in a horizontal right-to-left sweep. The issue is that even if you hold the button to perform a charged attack, the horizontal sweep will still execute. So it is impossible to do a push-stab into charged attack without wasting precious time either performing the horizontal sweep or block-cancelling. And the attack is nothing different from a normal light attack, so i dont see the point of it being there in the first place.
The sweep should not have priority over a charge attack.