We hope you don't mind that we reply in English. If you want, you can get Portuguese support via email with this contact form. You can also find us on Facebook or Twitter.
We're already aware of this behaviour and our team is already working to have a solution as soon as possible. For now, there's another way to look up your friends if you know their usernames. You can do it if you put spotify:user:[username] on the search bar in the app.
Let us know if that helps or if you have questions.
Help others find this answer and click "Accept as Solution".
If you appreciate my answer, maybe give me a Like.