Issue #3007478 by tostinni: Excluding textfield from autosubmit remove all attributes on the input

src/Plugin/views/exposed_form/BetterExposedFilters.php

@@ -692,7 +692,7 @@ Title Desc|Z -> A</pre> Leave the replacement text blank to remove an option alt
       if (!empty($settings['general']['autosubmit_exclude_textfield'])) {
         foreach ($form as &$element) {
           if (isset($element['#type']) && $element['#type'] == 'textfield') {
-            $element['#attributes'] = ['data-bef-auto-submit-exclude' => ''];
+            $element['#attributes']['data-bef-auto-submit-exclude'] = '';
           }
         }
       }