Resource bundle not being used in dynamic dropdown

As described here: https://xmdocumentation.bloomreach.com/library/concepts/component-development/define-configuration-parameters-for-dynamic-components.html

Create a resource bundle
Add a dynamic dropdown to a document
use the id of the resource bundle as sourceID
(specify org.hippoecm.hst.platform.configuration.components.ResourceBundleListProvider as valuelistProvider, though this is officialy the default)

Dropdown remains empty