Duolingo skipped Last Question.
I was doing lesson 3 of Spanish: Common Phrases, and almost done. On the second to last question it froze a little, and then started to congratulate me for finishing that section.
I leveled up at the same time, and I had three hearts if this is relevant. I also got distracted and left it on one of the speaking questions for a while.
Something similar happens to me 100% consistently. whenever I test out a german skill and I still have a couple lessons left, Duolingo skips the last question but it simply goes back to the main page without any message, reward or progress whatsoever. it's as if I've cancelled the test. Right after that though I can do the same test again and it does work.