There is visible flickering during the last second. Moving frame by frame: the blue highlight goes unseen together with Clear History, then it's Settings for Th

There is visible flickering during the last second. Moving frame by frame: the blue highlight goes unseen together with Clear History, then it's Settings for This Website, then Hide Others, then Quit Safari twice, the highlight reappears on Hide Safari, then disappears with Clear History. A little bit later Settings for This Website is highlighted but the text stays dark instead of becoming white.