If you undock a tab then you cannot re-dock it into the original Brave application window.
I reorganised the browser tabs on my screen. When I moved the move below the “horizontal line” of where the tabs are displayed, the tab un-docks. From that point you cannot re-dock the tab.
What did I expect to happen
When I positioned the tab over the other tabs the tab should allow me to redock.
Windowing System: X11
Kernel version: Linux 6.3.12-200.fc38.x86_64
Graphics: Intel® UHD Graphics (TGL GT1)
** Brave Version **
Version 1.56.11 Chromium: 115.0.5790.102 (Official Build) (64-bit)