@Mattches circling back to this, I now recognize what is happening. It’s related to the conversation at The space at the top of the tabs after the new update on Brave Nightly is mad annoying
Basically on Nightly (and possibly Beta) where the tabs are larger, if you have your cursor at the very top of the screen and click, it won’t select the tab. So here on Release, clicking with cursor there would switch to the tab (talking as far up as you can go)
But on Nightly with the bigger tabs, if you click very top edge of the computer screen, it doesn’t select the tab when you click. Instead it’s clicking as if you’re hitting the border of the window or whatever is behind it.