For the past two months, I held back GNOME 46 packages since I was experiencing login hangs -- I've been meaning to look into it but got lazy about it.

However, seeing libgdm-46 in my latest batch of updates gave me hope: https://bbs.archlinux.org/viewtopic.php?pid=2159642#p2159642

And yay! I'm able to login with GNOME 46 now! So my IgnorePkg list is now empty once again!