Testing out of Lessons bug
I think there is an error of testing out of lessons. I stopped doing duolingo before the switch over to crowns and I was going back to do the beginning lessons. I found them kind of boring so I started to test out of them. While doing this I noticed that for each skill the test only covers <10 unique phrases. I thought it strange that every level had the same phrases in it so I decided to test a lesson and level 3 and level 4 has new and different phrases than what is being used to test out of that level. The test out of level 3 to 4 (ect.) seems to not be updating the phrases per level and isn't actually testing you on the current lessons!
Edit: To clarify - The phrases used to test out of any level (such as level 3 to level 4) is identical to the test out of level 1 and does not add the new phrases in the later lessons. It will only test you on level one phrases.