transcriberbin: Panic in specific scenario
!1856 (merged) introduced a bug that panicking at
thread '<unnamed>' panicked at video\closedcaption\src\transcriberbin\imp.rs:632:35:
called `Result::unwrap()` on an `Err` value: WasLinkedhttps://gitlab.freedesktop.org/seungha.yang/gst-plugins-rs/-/tree/transriber-panic-reproducer?ref_type=heads has passthrough-notify example update for reproducing