First thread:
It works fine right now.
Second thread:
I don't see there anything about a bug with flametongue.
Current thread about another bug, that flametongue on main hand provides bonus damage for lava lash aswell as on off hand. No one report it untill now. So, devs didn't anything wrong.
And actually, priority of this issue is 1/10. No one will use windfury on off hand, because it will deal 50% less damage (penalty for off hand melee damage). While flametongue on main hand doesn't gives any benefits compared to off hand flametongue.