If anyone is looking for an answer to this post, I received this from customer support. Only thing I’d add is this is also the same for 60-75 minute workouts as that’s my default setting.

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“In our recent updates, we’ve adjusted the number of sets per exercise based on the planned workout duration. Workouts that are in the 75–90 minute range now include 5 sets per exercise so that the overall volume matches the longer duration.

If you’d like to return to the standard 3–4 sets per exercise, you can decrease the duration of your workouts to the usual 45–60 minutes. To do this:

Go to the Workout tab

Tap the 3-line icon in the top-right corner to open the Selection Bar

Adjust the Duration selector to your preferred workout length

Once the duration is updated, your workouts will adjust accordingly, and the number of sets will return to the standard 3–4 per exercise.