[Form]: Bug at HiddenType: DEFAULT_PLACEHOLDER #13471
Description
At https://symfony.com/doc/3.4/reference/forms/types/hidden.html#empty-data, the value DEFAULT_PLACEHOLDER is displayed on the page
{{ message }}
At https://symfony.com/doc/3.4/reference/forms/types/hidden.html#empty-data, the value DEFAULT_PLACEHOLDER is displayed on the page