Headphone jack not recognized when plugged in

Only keep one of them running.

As explained by @nikgnomic Pipewire can be disabled to continue using PulseAudio. Use this command to stop, disable and mask Pipewire services:

systemctl --user disable --now pipewire.socket pipewire.service && systemctl --user mask pipewire.socket

Alternatively, all Pipewire packages are needed to replace PulseAudio, which can be installed with this command:

pamac install manjaro-pipewire

and only Pipewire would be shown on the system.

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