2.13.0's ShelfRefreshWorker boots a second headless FlutterEngine in
the app process to refresh the launcher row every six hours. Its
foreground guard is checked only once at worker start, so launching the
app during a run leaves two engines sharing a low-RAM TV for up to 90
seconds, and a failed run retries with backoff. Suspected of
destabilizing the compositor on the 32-bit TCL panel in #1862. The tvOS
Top Shelf live fetch is unaffected and stays.
The foreground sync pipeline keeps the row fresh while the app runs, as
before 2.13.0. Updated devices still carry the persisted periodic job,
which would wake the process once more only to fail instantiating the
deleted class; the package-replaced receiver now cancels it.
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