CupertinoSliverNavigationBar with extended large title doesn't have a transparent background with transitionBetweenRoutes #168406
Description
Following up from #164956 (comment).
Currently, CupertinoSliverNavigationBar with transitionBetweenRoutes has an opaque background mid-transition:
Screen.Recording.2025-05-06.at.11.26.34.AM.mov
Native iOS nav bars have a transparent background when the large title is extended, but an opaque background when the large title is condensed: