Deleting the last episode or season from a detail page popped the wrong route whenever something covered the detail: the download progress dialog (the deletion event fires before the delete returns), a player, a sheet fallback modal, or another detail. The cover disappeared and the empty detail stayed on screen.
The detail now leaves through the route it was pushed as: popped when it is current, removed from under the cover otherwise, with the same null result; a detail that is the navigator's only route stays, and a route already leaving is not touched twice. A delayed player launch checks that the route it was started from is still active before pushing, so a launch whose detail was deleted during its awaits does not land on an unrelated screen.
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