apple x heart rate measuring problem while doing workout

During my outdoor walking workouts, it would take 4 minutes before my heart rate began to register on my watch. I experienced the same issue when running - it took 3 minutes for my heart rate to be recorded. I had previously reported this problem to Apple customer service when I was using a Series 7 watch, hoping it would be resolved. However, even after upgrading to two newer generations of Apple Watches, the problem persisted on the 10th generation model as well. I'm wondering if anyone else has encountered this same heart rate tracking issue with their smartwatches.