Missing workout in Zwift 101: Cycling?

Hello there,

I am enrolled in the Zwift 101: Cycling training plan, and while I am finding it worthwhile, the numbering is a bit weird.

I’ve done workouts 1 and 2, but the next ones are numbered 4 and 5. Am I missing something? I’ve seen a website called What’s On Zwift show there to be a ramp test as the third workout - should I be doing that next?