Teacher has separated my kid in a separate seat by himself

Hi, my kid is in 4th grade and has been seated in a seat by himself. This has been going on for weeks. I knew something like this would happen because he is very chatty and the teacher has spoken to me
About it before. He scores very high/perfect on exams, never misses assignments and has 100% attendance. We really do so much with him at home but I can’t seem to get the chattiness to improve. The teacher didn’t tell me he is in a seat by himself, I found out through my kid. Other kids have been given the same punishment but they usually get to go back to their regular tables after a week or so. It makes him feel isolated and is destroying his self esteem. Should I just forget about it bc the year is ending or try to talk to her about this? I get this is probably her classroom management strategy but the length of time he is there really bothers me. With past teachers, they complained about the chattiness as well, but always complimented his performance in school. His teacher this year has not really had anything positive to say about him despite him consistently doing great work on all his tests and assignments.