Recently Brave has been putting some of my tabs to sleep even though I have Memory Saver turned off. It doesn’t happen consistently, but I’ll come back to a tab which has to reload.
It usually happens after returning to a minimized tab group after a while, but I haven’t tried to test if it happens to tabs outside of groups.
It feels like this started to happen after the update that broke cursors for a bit last month. I haven’t seen anyone else bringing it up so it could just be a ‘me problem’, but I thought I’d ask for some insight. 
Brave Version: 1.76.74