Just for clarity, I wasn’t expecting anything to change with that code block — but I was expecting some sort of output, even if the values were null or undefined.
And a bit more, this being enabled/disabled shouldn’t affect it being included in admin_config_login_routes unless the app explicitly unloads all plugins by starting the server with LOAD_PLUGINS=0.
With the console block I asked you to run, I was hoping to be able to see the value (or missing value) on admin_config_login_routes. It shouldn’t be possible for that to be empty, and even an empty array should work for the map function.
These are mostly thoughts and I’ll ponder some more on ways we can figure this out. It would be nice to be able to see more of your setup, even though you said you only have official Discourse plugins.
I guess a good question is were the plugins you have installed all of the default ones that are bundled with core Discourse, or do you have some additional plugins from Discourse installed as well?