我正在做一个项目，在这个项目中，我在表单提交后使用flash会话来显示消息。但问题是flash会话消息有时会出现，有时不会。我在这里也分享了代码。
这是一个函数：

public function edit_department(Request $req,$id)
    {
        $dep = department::where("externalid", $id)->first();
        if(!$dep)
        {
            return ['message' => 'Department Not Found'];
        }
        $supervisors = member::select("id","name")->whereRelation("get_role","role_code","=","supervisor_13")->get();

        if($req->method() == "POST")
        {
            $req->validate([
                'name'=>'required|min:3|max:60',
                'supervisor'=>'nullable|exists:members,id',
                'time' =>'required|integer|min:1|max:50000',

                'description'=>'nullable|max:2999',
            ]);

            try
            {
                $sup_temp = $dep->supervisor_id;
                $dep->name = $req->name;
                $dep->ticket_time = $req->time;

                $dep->description = $req->description;
                $dep->supervisor_id = $req->supervisor;
                $desc = "";
                if($dep->save())
                {
                    if($dep->wasChanged())
                    {
                   
                        $desc = "The department ( ".$dep->name." ) has been updated"." by ".session("cms_member_name")." (".session("cms_member_role_name").")";
                        $users = array();
                        $this->mail_subject =" Department Updated";
                        $this->mail_body['description'] = $desc;
                        $this->mail_link = "department/profile";
                        $users = $this->get_mail_members($this->mail_subject, $this->mail_body, $this->mail_link, ['manager_12','super_admin_11'],[],$users);
                       
                        dispatch(
                            function () use ($users)
                            {
                                $this->send_to_members("","","",$users,"false","2");
                            }
                        )->delay(now()->addSeconds(config("app.queue_time")));

                        return redirect()->back()->with(['form_submit_flag' => 'true', 'form_submit_msg' => 'Department Edited Successfully']);
                    }
                    else
                    {
                        return redirect()->back()->with(['form_submit_flag' => 'false', 'form_submit_msg' => 'Nothing was changed']);

                    }

                }
                else
                {
                    return redirect()->back()->with(['form_submit_flag' => 'false', 'form_submit_msg' => 'Department Was not edited Successfully']);
                }
            }
            catch(Exception $ex)
            {
                return redirect()->back()->with(['form_submit_flag' => 'false', 'form_submit_msg' => "An Exception Occured. ".$ex->getMessage()]);
            }
        }

        return view("department.edit_department",compact("supervisors","dep"));

    }

现在这是刀片代码：

@if(Session::has("form_submit_flag"))
@if(session("form_submit_flag") == "true")
<div class="alert alert-success text-dark alert-dismissible">
    <button type="button" class="close" data-dismiss="alert">&times;</button>
    <strong>Message! </strong> {!! session("form_submit_msg") !!}
  </div>

@elseif(session("form_submit_flag") == "false")
<div class="alert alert-danger alert-dismissible">
    <button type="button" class="close" data-dismiss="alert">&times;</button>
    <strong>Message! </strong> {!! session("form_submit_msg") !!}
  </div>

@endif

@endif

这就是路线。

Route::match(['get','post'],'edit_department/{id}',[DepartmentController::class,"edit_department"])->name("edit_department");

现在你可以看到我还有队列代码要执行。现在当我提交表单时，blade中的flash消息有时会出现，有时不会。但是所有代码都工作得很好。没有错误发生。只是flash消息没有出现。我在做什么错误吗？
任何帮助都将不胜感激。
这是路线表

| user_auth                                |
|        | GET|POST|HEAD | edit_department/{id}          | edit_department             | App\Http\Controllers\DepartmentController@edit_department              | web                                      |
|        |               |                               |                             |