Has anyone noticed wonky blood Oxygen readings since the 5th beta? I take mine manually, and have been doing so since Watch3. Prior to that with a pulse oximeter. My blood O2 has always been in the 97% to 100% range. Since this 5th beta it has ranged from 82% to 91% to 99%, and is generally freewheeling. If I were actually at 82%, I would likely be on the floor. I learned early on with Watch3 to avoid arm hair and freckles to get more accurate readings to the point of shaving arm hair under the watch. It has worked great up until now, very erratic.
Follow-up: tonight the blood Oxygen routine suddenly started to "train" me on how to use it - twice! (4 training screens and an "OK" button for me to hit, then repeat). That was interesting after all this time.... The 5th Beta may need a little work after all.