I have a similar problem like here: https://answers.microsoft.com/ru-ru/windows/forum/all/windows-10/98138a7a-b2f3-4dcb-be0f-83b55118e306
The essence of the problem: when you start any application using a microphone, the sound is muted and becomes distant.
But I've already taken the advice and set my default headphones to be the default communication, and also the playback device at the same time.
At the moment, nothing helps from what I find. What else can you try to solve the problem?
Screenshots: