Accuracy of the activity move ring

I upgraded my watch last December, and on this new model I've noticed that, on rare occasions, the Move activity ring will suddenly delete up to 70 calories within the same day. I'll look at it, and mentally note its status, then shortly after look at it again and notice the dropped count. Has anyone else noticed this?

I've had the Apple watch for nearly 3 years, and have never missed a day of closed activity rings. Every day, I've received the "longest move streak" notification, but then last month I observed that it was no longer popping up. I went back into my activity history and noticed that on May 11 '23 the move ring was one calorie short of the goal. ONE CALORIE!! Since I never remove my watch at the end of the day without the rings first being closed, I can only assume that the move ring was closed, I removed the watch and placed it on the charger, then the move ring reversed its count, thereby blowing my nearly 3-year streak. What is the margin of accuracy with the watch so I know how much to exceed the goal each day to protect my accomplishments?