Could you point why a Controller method code is subtly returning to a jquery ajax without running and returning OK to JS ?

Vitrine.prototype.salvar = function(){
    
  console.log ('JS salvar');
  
  $.ajax({
    url: '/vitrine/salvar',
    
    method: "POST",
    data: {
      _token: $('input[name="_token"]').val(),
      id: $('#id').val(),
      url: $('#url').val(),
      inicio: $('#inicio').val(),
      termino: $('#termino').val(),
      title: $('#title').val(),
      description: $('#description').val(),
      points: $('#points').val()
    },
    error:function(data){
      hotsite.openModalCustom("Erro", data.responseText, "Entendi", "error");
    },
    success: function(data){
      hotsite.openModalCustom("Sucesso ao salvar", data.retorno, "Entendi", "success");
      hotsite.closeModal('mEditor');
      //hotsite.vitrine.filtrar();
    }
  });
};

 public function salvar(Request $request){
   
	 //Forcing an error
	 //aaa;
	
	
	// Otherwise subtly exit with no traces.
	info('xxx');
   
	dd('aaa');

	$id=$request->input('id');
	$url=$request->input('url');
	$inicio=$request->input('inicio');
	$termino=$request->input('termino');

	$titulo = $request->input('title');
	$descricao = $request->input('description');
	$pontuacao = $request->input('points');

	try{
		if($id != '' &&  $id > 0){
		  $vitrine = Vitrine::find($id);
		}

		if(empty($vitrine)){
		  $vitrine = new Vitrine();
		  $vitrine->created_at=new \DateTime();
		}
			
		$vitrine->title = $titulo;
		$vitrine->description = $descricao;
		$vitrine->points = CustomFuncs::brancoParaNulo($pontuacao);
		$vitrine->url = $url;
		$vitrine->validity_start = empty($inicio) ? null : CustomFuncs::formatarDataUS($inicio);
		$vitrine->validity_end = empty($inicio) ? null : CustomFuncs::formatarDataUS($termino);
		$vitrine->updated_at=new \DateTime();
		
		info($vitrine);
		
		
		$vitrine->save();

	} catch (\Exception $e) {
		return response()->json(new Resultado(true,'','Erro ao salvar o vídeo'), 400);
	}

	return response()->json(new Resultado(false,'','Vídeo cadastrado com sucesso'));

}