Multichannel voice sound stopped working after December update

Thanks @grahamh and @sam_nazarko,

I saw in this thread Soundbar problems after December update that could probably come that my vero 4k is wired like that :

Vero 4k > TV > Ampli

So, my tv does’nt advertise 5.1 channels.
I’ll try later this week to plug the Vero 4k directly to my ampli and I will let you know .

But I wonder why this setup worked fine till this update.

Cheers,