Shredder vs. Saberon (Horde)

This is currently bugged for me, trying to cut the Vine, and it "works", but dont get credit. So yeah, im currently stuck here on the questchain...

Have tried Abandoning and retaking, no sucsess! :/

The location of the Strong Vine Barricade is at 52.2, 48.7.

To get there go to the right(north) from the cave where you picked up the quest. Go right(south-east) as soon as you find the path, and at the crossroad turn right again(south-west), then go straight.

Apparently you don't get credit for the quest if you try to destroy the barrier while in your shredder.

Instead, leave your shredder and right-click the barrier: you'll appear inside your shredder for a few seconds while the barrier is removed. Afterwards, walk through the barrier towards the other side, and hopefully you'll get credit.