I am having the same issue since installing XCode beta 2. Even when I try to go back to beta 1 it still has this issue.
It seems like this happens when I use more complex views. When replace my views with simple text views the tabs work fine.
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I am having this problem on Xcode 10.5. It seems that this problem is only occurring in one direction. When I update the applicationContext on the watchOS simulator it correctly sends to the iOS simulator but not the other way around. Hoping for some insight on this!
I've also run into this problem. Any solutions?