I had a look in the logs and there is something up with at least that activity. I will look into it over the weekend.
2025-04-25 15:22:11.926 WARN 1 — [431097582-68123] icu.intervals.wahoo.WahooService : Athlete xxx activity has null workout_summary: xxx 2025-04-25T10:30:09.000Z Virtual Cycling
2025-04-25 15:22:11.926 DEBUG 1 — [431097582-68123] icu.intervals.wahoo.WahooService : Athlete xxx got: xxx 2025-04-25T10:30:09.000Z Virtual Cycling
That missing workout_summary is the thing that references the workout file. Lots of other people are getting activities from Wahoo so it’s not everyone.