What is the ruling of the Sharia on a lawyer who causes his client to lose their rights due to his ignorance of the litigation process or defense, and can this be compared to the case of a judge who rules out of ignorance?

A lawyer is an agent, and if an agent acts in a way that is not in the best interest, the principal is not obligated to accept his action. If he oversteps or neglects, he is liable for the consequences. Therefore, what the lawyer proposes that does not conform to the truth is not binding on his client; rather, the client has the right to reject it. If the lawyer causes his client to lose a right due to his ignorance or negligence, he is liable for it.