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During a popstate event, we attempt to render updates synchronously even if they are transitions, to preserve scroll position if possible. We do this by entangling the transition lane with the Sync lane. However, if rendering the transition spawns additional transition updates (e.g. a setState inside useEffect), there's no reason to render those synchronously, too. We should use the normal transition behavior. This fixes an issue where useDeferredValue during a popstate event would spawn a transition update that was itself also synchronous. DiffTrain build for commit https://github.com/facebook/react/commit/6db7f4209e6f32ebde298a0b7451710dd6aa3e19.