Issue #3380638: Not possible to exclude selected media bundles

src/Controller/DisplayController.php

@@ -140,13 +140,13 @@ class DisplayController extends EntityViewController {
     if (!empty($config->get('media_bundles'))) {
       $allow_all_bundles = TRUE;
       foreach ($config->get('media_bundles') as $allowed_bundle) {
-        if ($allowed_bundle !== 0) {
+        if (!empty($allowed_bundle)) {
           $allow_all_bundles = FALSE;
           break;
         }
       }
 
-      if (!$allow_all_bundles && isset($allowed_bundles[$media_bundle]) && $allowed_bundles[$media_bundle] === 0) {
+      if (!$allow_all_bundles && isset($allowed_bundles[$media_bundle]) && empty($allowed_bundles[$media_bundle])) {
         return $this->updateRenderCache(parent::view($media, $view_mode), $config);
       }
     }