Unusual sound on automix transition during Airplay listening and unavailability of automix on tvOS 26, 26.1

Hello everyone, does someone experience a crapy sound on transition with automix during airplay listening ?

Another related question about automix, why it isn't available on TvOS 26, 26.1 ?

Thanks for help

Marc

[Re-Titled by Moderator]

Original Title: automix with airplay