What happened to the PL-400 course syllabus?

I was working my way through the MS Leran PL-400 modules since the start of this year. I took a break for a few weeks, but when I revisit it today, most of the modules are missing or change?

https://learn.microsoft.com/en-us/training/courses/pl-400t00

There is now only 9 modules when there were about 30 before? And most modules I have notes on (Delegation, relationships, advanced formulas) are missing!

Was there a change made to the certicate? Or to MS Learn that I missed?