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The cancellation reaches OpenZaak correctly (Geannuleerd status_created), but the verify read-back ran 'docker run python:3-slim python -' without -i, so the heredoc never reached the container's stdin and the script was empty — the check always saw an empty status. Add -i so the read actually queries OpenZaak. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>