Delphi10.3的DBGrid中memo类型显示内容而不是(WIDEMEMO)

procedure TForm1.FormCreate(Sender: TObject);
begin
FDQuery1.Connection := FDConnection1;
FDConnection1.LoginPrompt:=false; //取消登录提示框
FDConnection1.Open('DriverID=SQLite;Database=test1.Sqlite3.db');
end;

procedure TForm1.FDQuery1UserNameGetText(Sender: TField; var Text: string;
  DisplayText: Boolean);
begin
Text := Copy(FDQuery1UserName.AsString, 1, 50);
end;