In order to keep applications alive in the patch bay even when they are playing no sound, I did the following :
https://ask.fedoraproject.org/t/how-do-i-disable-audio-sink-suspend-on-idle-using-wireplumber-and-pipewire-on-fedora-35-so-that-my-audio-isnt-delayed-when-playback-resumes/18076/2