What is the ruling on the salary received by a chronically ill government employee whom the higher authority at his workplace permitted to work two days a week, and whose direct manager exempted him from any work, while the higher authority specified a certain amount of work for him?

If the direct manager takes over the tasks of another employee and performs them himself, without injustice to others, then the employee's salary is permissible. However, if this leads to neglecting work or obliging another person to do it without their consent, then it is not permissible.