Selecting Home from the sidebar on TV left focus on the collapsed sidebar item: the content appeared, but the remote went nowhere. MainScreen hands a tab over while focus still sits on the sidebar item that selected it, and the guard added to lapse stale rail-focus claims read that as the user having navigated away.
Where focus sits cannot tell a live handoff from a stale claim. What distinguishes a stale claim is that focus moved after it was armed, so the claim now records the primary focus at arm time and lapses only once focus has changed and rests off-screen. A handoff made while hubs are still loading is honored when they land; a claim armed on a bare scope still lapses when the user moves to the sidebar.
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