I don't see anything in the current bug bin regarding zeta vader in Raids and there are obvious issues in both.
Let's start in the Pit raid. Vader zeta seems to be working properly in p1, but as you advance to p2, p3, and p4, the turn meter reduction is occurring at a greater frequency than is intended. It appears that the problem gets progressively worst in each phase. By the time you get to phase 4, turn meter on rancor is reduced on nearly every turn. There are plenty of YouTube videos out there to demonstrate this. In p4, the rancor turn meter bar never moves from empty.
On to the AAT raid...
In p3 of the AAT raid, damage caused by Palpatine's shock on the b1 droids is not triggering any chance of turn meter reduction under Vader zeta lead.
Please look into these issues. The ease of soloing the Pit raid with Vader lead is causing issues in a number of guilds and needs to be addressed.
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Vader lead provides a 50% chance to remove 20% TM when they damage an enemy. This turn meter reduction can not be resisted.
This video provides a good example of broken Zader. Skip ahead to p4 and it is clear to see that things are not working as they should.
Since it's been over a month, it's safe to bet it won't be fixed in a reasonable timeframe
Yup no issue at all. Two frames from the video above, right before and after Vader's basic attack, as well as turn meter comparison side-by-side here - http://imgur.com/a/N8bb7 Does this look like "20% TM reduction"?
I double-checked the bug bin thread and looks like there is some kind of acknowledgement there "NOTE (2/16):We are still investigating the issues with Vader’s leader ability & will keep you updated on further developments". Let's just hope we will see some change soon.