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Closing the controlling window left the controlled side waiting out ICE decay — ~25-30s in the peer's log, its disconnected/failed ladder running to completion — where TCP delivers a FIN at once. The session end closed the pc by spawning onto io_loop's own `#[tokio::main(flavor = "current_thread")]` runtime, which is dropped the moment io_loop returns, and nothing after that call yields: the task was never polled even once, so no DTLS close_notify ever left. Every attempt to fix that on the caller's side failed the same way, because the mismatch was never about where the close ran: a pc's UDP sockets register with the reactor, and its ICE/DTLS/SCTP pumps spawn on the runtime, that is current while it is built — so a pc created by a session outlives the only runtime that can drive its I/O, and a close driven anywhere else completes without reaching the wire. The bump homes them where they can outlive any caller: WebRTCStream builds on a process-lifetime runtime and every detached close runs there as its own never-cancelled task. io_loop keeps its plain close_webrtc() calls and only documents why nothing here may spawn or await the teardown on the dying session runtime. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016HV43uh1ztv6Wm5qi3Y1ne