I hadn't tried it before because I didn't expect that this problem might come from the kernel. But yes in my case it seems to come from kernel!
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dpkg --list | grep linux-image
rc linux-image-5.10.0-13-amd64 5.10.106-1 amd64 Linux 5.10 for 64-bit PCs (signed)
rc linux-image-5.10.0-14-amd64 5.10.113-1 amd64 Linux 5.10 for 64-bit PCs (signed)
rc linux-image-5.10.0-15-amd64 5.10.120-1 amd64 Linux 5.10 for 64-bit PCs (signed)
rc linux-image-5.10.0-16-amd64 5.10.127-2 amd64 Linux 5.10 for 64-bit PCs (signed)
rc linux-image-5.10.0-17-amd64 5.10.136-1 amd64 Linux 5.10 for 64-bit PCs (signed)
rc linux-image-5.10.0-18-amd64 5.10.140-1 amd64 Linux 5.10 for 64-bit PCs (signed)
ii linux-image-5.10.0-19-amd64 5.10.149-2 amd64 Linux 5.10 for 64-bit PCs (signed)
ii linux-image-5.10.0-20-amd64 5.10.158-2 amd64 Linux 5.10 for 64-bit PCs (signed)
ii linux-image-amd64 5.10.158-2 amd64 Linux for 64-bit PCs (meta-package)
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uname -mrs
Linux 5.10.0-19-amd64 x86_64
And the sound seems to work perfectly and everywhere!!! Tested : totem, vlc, firefox-esr, chromium!!
You can't believe it if you have bothered so much with such a simple - and not important - thing, that in the end everything works perfectly!
I feel better, freer and will definitely be more peaceful!
Is it better to report this also somewhere else or they are already know about that issue ?
I think now it is not necessary to open a different topic for this, but if you think it's still better, I can do it.
Thank you for your help!