I have Bays in today as well, during my rest week (one of the Tri base plans I think) and it’s not adapted out despite being marked as breakthrough.
In the past I don’t think I have seen adaptations in recovery weeks, usually they are set low PL workouts for recovery purposes, so it doesn’t make sense to adapt them upwards normally and they get left as default. Maybe that’s what’s causing it? Worth asking support.
I can see alternates though - I am probably going to do Pettit +1 or Mokelumne instead (fairly similar just with 2 sprints instead of 4), or Cheaha (3 sprints). That sounds like a bug?
I can get through Bays, it doesn’t look that hard - I think many people are likely to have relatively low PLs for Endurance in TR if, like me, you tend to do your longer rides outdoors. However I’ve just had a cold and I will have done an hour of cycle commuting before I start so the sub seems reasonable…