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In the second campaign, I still can't complete it as Humans – it's impossible to take the stone from the Elf when you accept the quest to capture the Orc city. This bug hasn't been fixed since almost the first version of the campaign. It's frustrating; I was so close to 100% completion as Humans.
Hmm, okay, the Elf stone is given automatically after defeating the Orcs, but the area where the Elf warlord is located is inaccessible, so you can't interact with the tree.
But I still managed to get 100% completion as Humans.