Can't Access Lesson 3 of Slang Skill
I've completed every lesson in the tree, including Slang 4 and 5, which I accessed via URL, but whenever I try to start lesson 3, it just takes me back to the main page. What's happening there?
Eventually I just tested out, but that took a lot of trial and error. It would have been better to complete the skill the normal way.
I was able to access the fourth and fifth lessons at https://www.duolingo.com/skill/vi/Informal-Expressions/4 and https://www.duolingo.com/skill/vi/Informal-Expressions/5 and it said I completed the skill so I didn't have to test out.