I am having the same problem. Same version of Xcode 15.4 and error.
Were you able to fix the problem? What was it? I am finding this incredibly frustrating as there seems to be no solution to it - no solution was provided from the Apple Development Support.
xcodeNewbie4321
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What I mean by displayed the same screen twice, when I clicked on a NavigationLink it would display the screen, then 1/4 of a second later, the same screen was presented again. When I selected '<Back', I would have to press it twice to return to my same screen. This also happened on child screens also..