On a task node, I set the "Compute additional assignees" field to "@
{CurrentUser.name}".
At runtime, the assignment works correctly if the current user is "Administrator", but if it is another user, the engine assigns the task to "system". I repeated that wrong behavior on two different workflow templates.
I attach a jar to reproduce, you can create a holiday request, go on to the summary tab, fire the "time off request" workflow, with a "normal" user, and the Administrator, to see the difference.