Yep, still having this issue. It's incredibly frustrating. Handoff still works and Siri Suggestions are showing tabs open in other devices but the actual iCloud Tabs function is all over the place. It shows me old tabs that aren't open, the close tabs feature doesn't work, the whole thing is a mess. I am now on the latest software for my iPhone, iPad, and MacBook Air but I can confirm that this started happening before I updated. I've reported it using the Feedback app on my Public Beta iPhone so we'll see if Apple will pull their finger out and fix something seemingly so basic.