After entering running or walking activity, and after trying to call somebody from watch or answer a call, there's no incoming sound. The interlocutor hears me, but I can't hear him.
A temporary solution is to select the phone app on the watch and enter the volume, click volume up or down, then you can hear the sound from the call
What may be cause this is that I have voice information about heart rate zones turned on during activities.
Also, when calling somebody and when voice message about HR zone starts, the watch microphone is automatically disabled for a time of voice message,but it's not so important for me as the problem above with no sound until pressing volume up or down of the call application screen
Update
Unfortunately, not only during a run, but also during inactivity, simply when I call someone on the watch or answer a call, I simply have no sound, only pressing the phone app and pressing the volume down or volume up key causes the sound from the phone to appear in the watch speaker, so this is not a bug related to running activity or walking activity
FW 13.19