D8 Views Template Suggestions Being Ignored I went through other questions/answers on this topic and I am still stumped. My added template suggestion for a Views Exposed form is being ignored.

function talon_theme_suggestions_views_exposed_form_alter(array &amp;$suggestions, array $variables) {
      $suggestions[] = $variables[form]['#id']. "__ef";
}


Template name in theme: views-exposed-form-views-programs-block-1--ef.html.twig

Theme Debug lists suggestion as: views-exposed-form-views-programs-block-1--ef.html.twig
A template name suggestion has to start with the theme hook and two underscores. You find the theme hook in the twig debug output, in this case views-exposed-form:

$suggestions[] = 'views_exposed_form__' . $mycustomdata;