Propagate the underlying cause of the ExecutionException as a RuntimeException directly, if this is already a RuntimeException. This keeps the behavior of multiplexed sessions and regular sessions equal, regardless whether the Delayed... route is taken for multiplexed sessions, or the direct route is used.
Propagate the underlying cause of the ExecutionException as a RuntimeException directly, if this is already a RuntimeException. This keeps the behavior of multiplexed sessions and regular sessions equal, regardless whether the Delayed... route is taken for multiplexed sessions, or the direct route is used.
Fixes #3132