There have been reports about this before. But these rides are a little different from
the others I have seen in the forum for which interval detection had failed. So here you go …
Have a look at the course. It’s plenty of turns on a 2 km course. So it’s: accelerate, brake, turn, repeat. Intervals only, if you will.
The power curve would look even “crispier” with a different GPS device. My Fenix watch is smoothing the data somewhat. (I did the comparison once on the same course.)