I’m on Fedora-43 and I installed Brave from the standard Software app.
Brave is currently unusable because of this problem. I’ve tried Opera and Vivaldi and they have the same problem. Firefox works, so I’ll have to stick with that.
I don’t think the error message is relevant, but here it is anyway:
chris@UNKNOWN:~$ flatpak run com.brave.Browser
[2:2:0202/045222.814604:ERROR:chrome/browser/ui/views/user_education/impl/browser_user_education_interface_impl.cc:154] Attempting to show IPH IPH_DiscardRing before browser initialization complete; IPH will not be shown.