Twig不显示带空格的String

I have a problem with Twig.

I have an object that contains one attribute whose type is a String. The String contains some blank spaces " ",(example "Prueba Primera"), but in the twig view when I show the text the view shows only "Prueba" the other part of the string doesn´t show. This is my object in php:

$informe->setTitulo("Prueba Primera");

This is my code in twig:

<input type = "text" name = "titulo"  id = "titulo" class = "texto"   value = {{informe.titulo}} disabled/>

And twig shows only : "Prueba"

add " around the twig value like that:

value="{{informe.titulo}}"