All skills unlocked but not completed
So, I was just playing around a few minutes ago and discovered something interesting.
I was bored and added a new language: Irish. I wondered if something I had been pondering for a while would work. I scrolled down to the very bottom of the tree and looked at the last skill--- Business.
I typed in "https://www.duolingo.com/skill/ga/Business/5" as a web address.
I did the lesson, and now all of the skills on the Irish tree are unlocked but not completed. I can start from the last skill and work my way up instead of the other way around. It also gave me lingots for "finishing" the skill.