For the Portuguese course:
I can confirm that Unit 62 is the last one which has circles that point to real Spiritual, Business and Politics lessons.
Rest of Units 63-75 only contain (locked/grey) "Personalized practice" circles.
The old PT course had 69 skills while the course update in summer 2018 extended the tree to 91 skills with an introduced nice splitted grammar sub 1-4 skill concept where complicated things were taught one by one in a strict order and not overwhelming the student immediately with ALL of the possible elements of just one grammar skill.
For example:
Prepositions 1-4
Prep Contractions 1-4
Demonstrative between Sub Contraction skills
So the grammar concepts could sink in and didn't hit you all at once but were spread out between skills.
No idea how they pressed the whole 69/91 skills tree into only 62 units.
Also the Infinitives 1-3 and Present 1-3 or Abstract Objects 1-4 skills had a lot of old lessons which means not only 4-6 lessons (like newer CEFR Spanish/French/English courses) to teach verbs and nouns/generic vocabulary but the classic way up to 10 lessons (7 words x 10 lessons for each skill number).
No idea why they pressed everything together and now all content got heavily mixed up.
Any Romance/Portuguese grammar teaching concept from contributors team is gone that way.
Duolingo points me for a six years old finished crown L2 PT tree at Unit 49 Use infinitives; rest is locked.
I was working lately on L3 crowns for Present 1-3 and Infinitives 1-3 skills on the old 5.52.5 Android app ignoring the snake (Ok, I did 3 lessons once for Unit 49 on the path ; but will carefully destroy their metrics from now on).