iOS saves screenshots of tabs. I scrolled through my own and found a bunch of old tabs (didn't realize I had so many) that just showed pure black. macOS saves

iOS saves screenshots of tabs. I scrolled through my own and found a bunch of old tabs (didn't realize I had so many) that just showed pure black. macOS saves screenshots too, to show when hovering over a tab. Curiously, it doesn't seem to use these saved screenshots in Show All Tabs. Also I just tested, Show All Tabs on macOS is no longer loading unloaded tabs. I have a window with 13 tabs right now, only two of which I've visited since launching Safari, and the others just remain as blank in Show All Tabs.