My post is not really about a bug, but rather a misunderstanding of Garmin's software strategy. Since version v18.x the wrist heart rate sensor works simultaneously with external heart rate chest strap. Ok, I understand the Garmin Pay story. Honestly, this software advancement comes at the expense of the real usefulness of the watch.
Where I live, it's still a bit cold and wear my watch over my jacket with an external heart rate monitor (Polar H10). Surprise! Garmin decided to invent a wrist heart rate to make shopping easier!!!! Sorry to say that there is no logic in making this choice and especially when my entire country (Canada) is poorly served by the Garmin Pay service. :(
I understand that the external heart rate monitor will be the only data used for all the metrics, but as soon as I stop the activity, the watch, even if it does not touch my skin, continues to invent values. Additionally, the recovery heart rate is wrong at the end of my activity.
No Jacket Mode either!? This mode is designed for when you may not be wearing the watch directly on your wrist.
Why Garmin???
Here's an example of a light run while wearing my watch over my sleeve. Software v18.26.