[BUG] ALC256 headset audio distorted when TRRS headset is present at boot

Laptop: Acer Aspire A315-44P (board Callisto_LC, BIOS V1.08)
Codec: Realtek ALC256, subsystem 1025:1640
Kernel: 7.0.8-arch1-1
Distro: Arch Linux
Headset: Sennheiser HD 400S with TRRS cable

Problem:
If the headset is connected before boot, playback is distorted/low
quality until I unplug and replug it once. After replugging, audio
becomes normal.

This reproduces across multiple distros, so it does not look like a
userspace configuration issue.

Observed state:

In the bad state, the headphone output pin is detected, but the
headset mic pin stays absent.

After unplug/replug, both headset mic and headphone pins are detected correctly.

A copy of the alsa-info.sh output is available @ https://pastebin.com/aP4MdTY9