What are provisions for sanction or deemed sanction for prosecution of public servant under S 218 of BNSS?

[Educator]

218. Prosecution of Judges and public servants.—(1) When any person who is or was a Judge or Magistrate or a public servant not removable from his office save by or with the sanction of the Government is accused of any offence alleged to have been committed by him while acting or purporting to act in the discharge of his official duty, no Court shall take cognizance of such offence except