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`tty7 wait` is the one address-taking verb that does not refuse a pane the server has no record of. `capture`, `procs`, `send` and `pane close` all exit 1 on the same address; `wait` answers `exit`, `matched: true`, `stale: true`, and exits 0. That is the right behaviour and must not change. The server forgets a pane once it is reaped, so "the worker finished and was cleaned up" and "that id never existed" are one question to it — measured, not assumed: a pane that really ran and exited comes back byte-identical to `%9999`, and `pane ls --all` has forgotten both. Refusing would break the first case, which is the ordinary end of an orchestration: you wait on work that may already be over. What was missing is that nobody had written it down. Neither the CLI reference nor the orchestration page said what an unknown pane does, and both define `exit` as "the pane is gone" — true of a typo, but not what a reader takes from it when every neighbouring verb errors. An orchestrator that trusts a bare `wait` as proof the work happened gets an instant success from a stale id and reads an empty capture as "no output". So both pages say it, and a test pins it. Without the test this is an accident that reads like a bug, and the obvious "fix" — make it error like its siblings — would silently break waiting on finished work.