I have noticed for a long time the problem of pinned tabs disappearing in the browser. This happens when I first close the window with pinned tabs, and then it doesn't matter whether they are pinned or new. My pinned tabs disappear. Restoring closed tabs doesn't make sense, because they haven't been closed, so there's nothing to restore. The only shortcut that works 50% is Ctrl + Shift + N, which doesn't always work and ends up wasting time and opening new tabs and re-pinning them.