Load the group

src/Decorator/ProductListingRouteDecorator.php

@@ -32,7 +32,7 @@ class ProductListingRouteDecorator extends AbstractProductListingRoute
         SalesChannelContext $context,
         Criteria            $criteria
     ): ProductListingRouteResponse {
-        $criteria->addAssociation('properties');
+        $criteria->addAssociation('properties.group');
         $criteria->getAssociation('properties')->addFilter(
             new EqualsFilter('group.netiToolKitAttribute.displayInListing', true)
         );