To be fair I’m not qualified enough to give you a proper answer. I think when this .pacnew arrived in Testing, a comment suggested that was the only thing to do, maybe with more explanation. I can’t find the message anymore. I’ll try to edit this message if I find it.
//EDIT: maybe one of these guys can answer Search results for 'mkinitcpio topic:34776' - Manjaro Linux Forum
invocation of random power users: @linux-aarhus @Chrysostomus @Fabby @moson
Can one of you guys clarify how to handle properly the new changes in mkinitcpio.conf.pacnew please?