Same for me, imported indoor bike workouts has no charts.
I sent two emails to support receiving only response about the work in progress about a possible fix...
I received this e-mail from Garmin Support on the 9th:
Dear ,
Thank you for contacting Garmin International.
The issue has appeared again, and been escalated to the highest echelons of investigation. We appreciate you patience in this matter, and apologize for the inconvenience.
With Best Regards,
Aaron
Customer Care - Fitness Team
Garmin International