Kernel 5.9.16-1-MANJARO is End Of Life and you should install Kernel v5.10
dmesg section is showing you have an out of date modprobe option
!!ALSA/HDA dmesg
[ 3.675809] snd_hda_intel 0000:00:1b.0: dmic_detect option is deprecated, pass snd-intel-dspcfg.dsp_driver=1 option instead
!!Modprobe options (Sound related)
snd_hda_intel: model=pch position_fix=1
snd_hda_intel: dmic_detect=0
The first modprobe option is not helping either
There is no model option pch listed in kernel documentation
and the PCH onboard audio devices is shown as device 0 and ignoring the position_fix=1
I suggest you find the file(s) where you created these modprobe options
grep -n snd /etc/modprobe.d/*.conf
Remove both of them and install package sof-firmware
Then reboot system and see if sound is working OK
The new modprobe option options snd-intel-dspcfg dsp_driver=1 might not be needed if the internal microphone array is supported by Sound Open Firmware drivers