The known_failure wrapper on test_channel_503_with_retry_after_is_retried_then_updates keyed on the one-attempt channel read. With update-path retries it passes, so the cell asserts plainly again.
The known_failure wrapper on test_channel_503_with_retry_after_is_retried_then_updates keyed on the one-attempt channel read. With update-path retries it passes, so the cell asserts plainly again.