With the drop of the new patch, a new bug has just surfaced with the speed in which the actions of hard targeting and mounting occur. They both seem to be related in that in order to get on your mount and hard target an enemy, you have to hold down much longer than before. More actions are having this bug as well such as sheathing your weapons. To elaborate, you essentially have to hold onto the button to what feels like two times longer; if you let go early then the action never happens.