We do not use port 9050 by default. Rather, we use 9250 by default, or 9260 in beta releases, 9270 in nightly builds, and 9280 or 9290 in developer builds. In the future, we plan to let the operating system choose an unused port number so there will never be collisions: https://github.com/brave/browser-laptop/issues/12936
What is the symptom that you are observing?