Looks like it got lost in translation/development. I've tried
[pt.se] [pt.so] [portugues.se]
but none renders into a Magic Link in the Comments box.
I've opened a pt.Meta question, but, as this is a network wide issue, I think posting here is the proper action to get the issue solved.
Also, given the future Russian, Turkish and Spanish implementations, I think this report/request/support question will prevent the same thing from happening when they launch.