I don’t see a roll back option
Could be that in a few days Brave will release an "Oops" update.
Have you tried to contact Brave about this? Do they have a user forum you can contact?
In settings, in the basic tab, there’s a section titled “Appearance”.
In that section, there’s a “Show Home Button”. Make sure that’s on.
That will add two options. start a new tab or enter custom irl.
Put your prefered homepage into the custom url box and then click the home button which should be right next to the back page, forward page, reload page buttons.