Strange volume levels when replay_gain_handler is specified as "mixer"

[janui]

The track I am playing:
># metaflac --show-tag=REPLAYGAIN_TRACK_GAIN --show-tag=REPLAYGAIN_ALBUM_GAIN "/mnt/MPD/NAS/Music/Paco De Lucía/Fuente Y Caudal/03 Reflejo De Luna (Granaína).flac"
REPLAYGAIN_TRACK_GAIN=-1.91 dB
REPLAYGAIN_ALBUM_GAIN=-3.86 dB

Expected Behavior

I would expect the volume control to be adjusted by the decibels specified in the gain replay tags.

Actual Behavior

># amixer -c 1 sget "Digital"
Simple mixer control 'Digital',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 207
Mono:
Front Left: Playback 184 [89%] [-11.50dB] [on]
Front Right: Playback 184 [89%] [-11.50dB] [on]

Version

># uname -a
Linux hifi 6.1.13-1-rpi-ARCH #1 SMP PREEMPT Thu Feb 23 12:17:10 MST 2023 aarch64 GNU/Linux
># mpd -V
Music Player Daemon 0.23.12 (0.23.12)

Configuration

Extract of MPD configuration file:
># cat mpd.conf
...
replaygain "auto"
...
audio_output {
name "snd_rpi_hifiberry_dacplus"
type "alsa"
device "hw:1,0"
mixer_control "Digital"
mixer_type "hardware"
mixer_device "hw:1"
replay_gain_handler "mixer"
auto_resample "no"
auto_format "no"
enabled "yes"
}
...

Log

The log is not included, MPD is actually working consistently. It just seems that the adjustment is incorrect.
When used without the 'replay_gain_handler' the software volume adjustment appears to be correct.

[gearhead]

as Janui mentioned in the closed issue #1785, when we set the replay_gain_handler to mixer and dissimilar file types are played, the volume can go to 100%. This is undesirable.