Is the salary received by an employee considered unlawful (haram) if he does not perform any work in his government job due to his manager's negligence, and instead spends his time browsing the internet?

The employee is a private contractor who earns his wages by making himself available to the workplace, whether or not he is assigned tasks. Entitlement to salary depends on punctual attendance during working hours, without tardiness, except as permitted by regulations. The manager's lack of attentiveness does not justify violating working hours or neglecting work. If this occurs, the employee is deprived of a portion of his salary commensurate with the violation of attendance and work.