It is not intended behavior and is a known bug that the workouts are being classified as struggles or fails for outside workouts. I posed the same question to Ivy early this week, and here was her response.
For the time being, you can click the three dots to on the workout page (you can see them to the right in the middle in your screenshot) and click to update the survey response. There should be an option at the bottom for “I did not struggle” or similar. Click that and it will serve you the normal success survey so you can appropriately rate it.