Apple fitness+ workouts disappeared?

i was happily working my way through the 30 day core challenge, and had a busy few days of work so missed two days. When I came back to try that collection, it was gone!

i can still see a subset of the collections I saw in the past (primarily yoga focused) but cannot see all the other collections that used to exist.

this is true across all my devices. I have also tried restarting all my devices (iPhone, Apple TV)