Somebody from proton told me how to solve this! See here. It was something incredibly simple nm-applet needs to be running for NetworkManager to use this feature. Definitely seems to be a case of some really lousy logging on NetworkManagers part.
Anyway, if anyone else encounters this, you just need:
-
gnome-keyringinstalled and started withgnome-keyring-daemon --startsomewhere in youri3config. - The
nm-appletrunning, again, put anexecin your i3 config.
Thanks all!