In Mar’ 23 another user posted this
Umbral Blades + Sword Thrower + Precision Cuts results in unexpected throw location
That post shows how Umbral Blades with Sword Thrower and Precision Cuts results in an unexpected throw location.
It is now Jan’ 25 and the bug is still occurring. There was a reply to this saying that there was a team tracking this issue. It isn’t a big one, but I would expect a minor bug like this to be fixed sooner than 2 years…
I would like to add to the original bug report by saying that if someone takes this combination, and moves the blades slowly out from the character, the disparity between mouse coursor location and blade spawn location grows with distance from the character. I’m not sure, but something is causing a growing disparity between the targetting location and the mouse with distance from the player location.