The minimum distance for an activity to save is 2Km and I’m sure @Eric_Schlange_ZwftIn knows this.
Tiny Race 4 didn’t even finish at the top of the first hill section by only being ~1.2Km long, it could have been 1.5Km and still finished before the short flat section.
Or simply had been 2Km and include the middle flat section plus a short bit of the second hill, the race duration was nowhere close to 15mins and it was the final Tiny Race anyway of the quartet!
You would have needed to freeride after Tiny Race 4 until you reached 2Km, in order to save, for less effort simply doing a u-turn after the race finish banner.