There is another discussion about some other Asus laptops with similar problems that may relate to this
but it is an ALC295 not ALC294
(even if there is no similarity @ZeroAnarchy can clone your Bugzilla report to get their issues reported upstream)
you have 2 links on Bugzilla to the old Manjaro forum that has recently been archived
https://archived.forum.manjaro.org/t/headphones-not-detected-kde/145544
https://archived.forum.manjaro.org/t/headphone-analog-not-working/145882
I see @lestarion has already commented on Bugzilla
Manjaro does not usually show dmesg data in alsa-info.sh, so it may help to add sudo dmesg | grep snd when supplying more data