Frequent failure of test__201__channel_serial_is_cleared_whenever_a_channel_entered_into_detached_suspended_or_failed_state

[maratal]

While preparing two PRs (#2207, #2210) one particular test showed up every other time - test__201__channel_serial_is_cleared_whenever_a_channel_entered_into_detached_suspended_or_failed_state

Example

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