10 files declare their use of NestedSetStorageFactory in Entity Reference Hierarchy 3.x

ChildEntityWarningBuilder.php in src/Information/ChildEntityWarningBuilder.php

ChildOfMicrositeLookup.php in modules/entity_hierarchy_microsite/src/ChildOfMicrositeLookup.php

EntityHierarchy.php in src/Plugin/EntityReferenceSelection/EntityHierarchy.php

EntityHierarchy.php in modules/entity_hierarchy_workbench_access/src/Plugin/AccessControlHierarchy/EntityHierarchy.php

EntityHierarchyArgumentPluginBase.php in src/Plugin/views/argument/EntityHierarchyArgumentPluginBase.php

HierarchyBasedBreadcrumbBuilder.php in modules/entity_hierarchy_breadcrumb/src/HierarchyBasedBreadcrumbBuilder.php

HierarchyChildrenForm.php in src/Form/HierarchyChildrenForm.php

HierarchyTreeSummary.php in src/Plugin/views/field/HierarchyTreeSummary.php

MicrositeMenuLinkDiscovery.php in modules/entity_hierarchy_microsite/src/MicrositeMenuLinkDiscovery.php

ValidHierarchyReferenceConstraintValidator.php in src/Plugin/Validation/Constraint/ValidHierarchyReferenceConstraintValidator.php