Go to Settings > Sounds & Haptics > Ringtone. Select a default ringtone. Normal output sound this time.

We can confirm now that the upper layer and the lower layer are normal. And the fault is caused by pseudo soldering of cylinders. We can fix the problem by soldering the two layers together. Also before soldering, we need to treat Pin S166 with jumper wiring.

Apply tins to the Via with Soldering Iron at 360℃. Prepare a length of tin applied Enameled Copper Wire of 0.02mm in diameter. Solder one end to the tin applied Via.