Aparece a mensagem no console do intellij, mas no insomnia continua com o "No body returned for response"

Segue o código das classes:

package med.voll.api.infra.exception;

import jakarta.persistence.EntityNotFoundException;
import med.voll.api.domain.ValidacaoException;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

@RestControllerAdvice
public class TratadorDeErros {

    @ExceptionHandler(EntityNotFoundException.class)
    public ResponseEntity tratarErro404(){
            return ResponseEntity.notFound().build();
    }

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity tratarErro400(MethodArgumentNotValidException exception){
        var erros = exception.getFieldErrors();

        return ResponseEntity.badRequest().body(erros.stream().map(DadosErroValidacao::new).toList());
    }

    @ExceptionHandler(ValidacaoException.class)
    public ResponseEntity tratarErroRegraDeNegocio(ValidacaoException ex) {
        return ResponseEntity.badRequest().body(ex.getMessage());
    }

    private record DadosErroValidacao(String campo, String mensagem){
        public DadosErroValidacao(FieldError erro){
            this(erro.getField(), erro.getDefaultMessage());
        }
    }
}

package med.voll.api.controller;

import jakarta.validation.Valid;
import med.voll.api.domain.consulta.AgendaDeConsultas;
import med.voll.api.domain.consulta.DadosAgendamentoConsulta;
import med.voll.api.domain.consulta.DadosCancelamento;
import med.voll.api.domain.consulta.DadosDetalhamentoConsulta;
import org.apache.coyote.Response;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("consultas")
public class ConsultaController {

    @Autowired
    private AgendaDeConsultas agenda;

    @PostMapping
    @Transactional
    public ResponseEntity agendar(@RequestBody @Valid DadosAgendamentoConsulta dados) {
        var dto = agenda.agendar(dados);
        return ResponseEntity.ok(dto);
    }

    @DeleteMapping
    @Transactional
    public ResponseEntity cancelar(@RequestBody @Valid DadosCancelamento dados){
        agenda.cancelar(dados);
        return ResponseEntity.noContent().build();
    }

}