Issue #3254252: A block isn't displayed in the node Preview mode

src/Plugin/Condition/Term.php

@@ -151,6 +151,7 @@ class Term extends ConditionPluginBase implements ContainerFactoryPluginInterfac
         'taxonomy_term' => 'taxonomy_term',
         'node' => 'node',
         'node_revision' => 'node_revision',
+        'node_preview' => 'node_preview',
       ];
       foreach ($potentialRouteMatches as $key => $potentialRouteMatch) {
         $entity = \Drupal::routeMatch()->getParameter($potentialRouteMatch);