Today I ran an easy run using my Forerunner 255. 5 warm up, 20 min easy at a pace 15 min optional and 5 cool down. I ran the 20 min easy almost perfectly to pace and then didn't have time for the optional do skipped it. I got a 55% workout execution score. This feels like it is because I didn't do the optional part. That seems very harsh. Is this intentional?