Heavy Input Lag with First Person Dual Wield Animation Canceling

Ffastyl

Shadowplay isn't working properly so I unfortunately cannot provide video of the bug.

I have tested without add-ons, in third-person and with varying button inputs to reproduce this bug. When animation canceling with heavy attacks, if the ability key (Rapid Strikes and Blood Craze were tested thoroughly) is pressed during the wind-up while LMB is held down, there is heavy input lag.

The heavy attack finishes, clipping out as expected under normal circumstances. The following ability does not fire, however. The Stamina cost is deducted as normal, but no audio, no animation, no damage in the floating combat text and no change in the enemy's HP aside from the heavy attack damage. Attack input is disable as if the ability is firing. One to four seconds after the first misfire, the damage of all misfired attacks (if animation cancelling continued) are simultaneously deducted from the enemy's HP and the audio(s) and animation(s) play. If the ability key is pressed while LMB is released, this does not occur. This does not occur for light attack animation cancelling. This bug does not occur in third-person. There is no latency spike or FPS dip nor do other entities cease to move, rubberband or exhibit other qualities of lag.