Since upgrading to iOS 13, my iPhone and iPad on one hand, and MacBook Air and Mac Mini on the other, only show open Safari tabs from the other device on the same operating system. The Macs are both running Mojave - is there any possibility that something about iOS 13 only allows Safari tabs to sync to Macs running Catalina?
Safari History also seems not to sync across operating systems. Handoff still works, albeit less consistently than it had when my iPhone and iPad were running iOS 12.
Anyone else seeing this?