I seem to be having the same issue as this on Android 13: https://zentalk.asus.com/t5/zenfone-9/default-notification-sound/m-p/362692#M3938
When changing the default notification sound, it doesn't change for apps set to use the default sound.
I changed the default notification sound to »None« but all notifications with sound still used the original notification sound. Changing to another sound for each notification works, but when set to »Default« it doesn't use the default sound set in Settings > Sounds, it just keep using the default sound the phone came with.
I recorded a new sound of 1 second silence and set that as default which works. This however lowers my music (to play the silent recording) when I receive notifications. It would be better if the default notification sound worked when set to »None.«
Included screenshot of the setting that doesn't work.
