The headphone sound issue was temporarily resolved.

I launched pavucontrol > input devices > and in the "sof-hda-dsp Headphone 
Microphone + Headset Microphone" I selected "Headphone Microphone" in the 
"Port" field.
As default, the "Headset Microphone" is set.

I have no idea why this worked.

But every time I connect my headphone, I need to change the settings as
mentioned above.

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https://bugs.launchpad.net/bugs/1906998

Title:
  no headphone sound after update 18.04.5 kernel 5.4.0-56-generic

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