Exception raised by task cannot be catched and handled by workflow

In a workflow template, I created a task which raises a Exception out to the workflow template. And in the outcome of the task, I activated this exception,

in the EHP4, the exception can be caught by workflow template and go the the branch of this outcome. But with EHP5 and higher, the same exception

cannot be handled. I don't know what happened with the workflow exception handling between EHP4 and EHP5. Can anybody tell the main difference in the exception handling of this part? Thanks