Intervals showing in MyWhoosh as 'Free Ride'

Workouts tagged MIxedMode like Purple Rain should include free ride intervals where target is a max effort not watts.

I believe you need to use export to ZWO option to include a target based on signature at time of export. Post above indicates Whoosh will sync whatever is queued as WOTD so other option is copy and edit the MixedMode workout to include hard targets and schedule that version on Planner.