From the patch notes:
Defile is no longer a choice node with Unholy Pact and has replaced Pestilent Pustules within the specialization tree.
Since, there are a number of issues. When Defile and Unholy Pact was a choice node I know I had Defile picked. After the patch, I have Unholy Pact selected on the right and Defile (not enough talent points yet) not selected on the left. But on my hotbar, and in my spellbook, I still have Defile instead of Death and Decay. And I can cast Defile with no issues, without having the talent.
With Unholy Pact new talent I have the point in there I guess because I have that choice node selected before the patch. Now, Unholy Pact is showing a Rank 1/1, obviously one point in it, and selected, but now it also, when you hover over it, is showing a Next Rank. Of the exact same info and 719 Shadow Damage over 15 seconds.
On top of that, it won’t let me unselect Unholy Pact now. I can right-click on it, nothing. I can right-click any node above it, all the way to Festering Strike, and still cannot remove the point in Unholy Pact.
Now, I can Reset Talents, either Right Side or All, and it finally remove the point in Unholy Pact.