Add workaround for views_aggregator.

Author: puresyntax71

src/Plugin/views/field/CustomEntityField.php

@@ -103,6 +103,9 @@ public function init(ViewExecutable $view, DisplayPluginBase $display, ?array &$
         $this->fieldDefinition->setCardinality($this->fieldMetadata['max_multiple']);
       }
     }
+
+    $options['entity_field'] = $options['field'];
+
     parent::init($view, $display, $options);
   }