So creating a workout with some HR targets and some Pace targets, the resulting workout that is expored to Garmin only has the either HR or Pace targets set:
This will either export the HR targets or Pace targerts, depending on which is selected in the workout editor, or HR if “auto” mode is selected - i.e. whatever is being shown in the workout graph.
It would be great to have both pace and hr targets exported to garmin.