I’m running Brave version 0.14.1, but I’ve seen this issue on previous versions as well.
When I type something into the location bar, the entire bar disappears. If I hit [ENTER], it behaves normally, taking me to the web page that was guessed from my history and the few characters I typed, and the location is again displayed.
Resizing the window does not reveal the bar. It seems to happen mainly when a search term is matched; if I type random characters when the bar is hidden, it is revealed once again.