Open tabs from previous session lost following Brave update

I’m running Brave here on my Mac Pro, using Mojave 10.14.6. Very simply, I updated Brave to 0.66.101 this morning via the About Brave menu and after relaunching all my open tabs have disappeared. There is no option now to re-open tabs from the previous session and I had about 20 pages open with reference to ongoing work projects that are all gone. How can I get these back?