I checked https://community.brave.com/c/common-issues and also searched from forum and found;
Tabs lose their URL in case of an error
Bugs with tabs and bookmarks when internet is disconnected and brave opens then internet is reconnected
… but these are closed for now.
I can confirm that problem persist - lots of “about:error” tabs after reopening laptop e.g. from sleep and URLs are missing. Also sometimes when reopening browser when it has been closed for a while. Cannot use Brave as lots of useful links were missed several times…
Brave installed from repository as guided here. Using 64-bit Linux Mint 18.2 MATE with newest kernel.
Update Channel Release
OS Platform Linux
OS Release 4.14.1-041401-generic
OS Architecture x64