Cannot complete the sidequest "Adding Fuel to the Fire"

Quest: Adding Fuel to the Fire (36)
Location: Coerthas Central Highlands - Dragonhead - Skyfire Locks

I have 7/8 Dry Firewood.
When I click on the last buried tree, nothing happens.
Other players in the same quest complained that it was not possible to catch the last buried tree, which is at the top, next to a building with another quest.

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