RepositoryEntityController.deleteItemResource does not work with @IdClass composite key

Defined a repository interface for CrudRepository<MyEntity, MyPkClass> with @RepositoryRestResource.
Relevant methods are exposed as endpoints.
Implemented a CustomIdConverter (implementing BackendIdConverter) in order to map a delimited string to MyPkClass.

POST and PATCH requests are working fine, but not DELETE.

Problem tracked down to the following RepositoryEntityController method.

@RequestMapping(value = BASE_MAPPING + "/{id}", method = RequestMethod.DELETE)
	public ResponseEntity<?> deleteItemResource(RootResourceInformation resourceInformation, @BackendId Serializable id,
			ETag eTag) throws ResourceNotFoundException, HttpRequestMethodNotSupportedException {

		resourceInformation.verifySupportedMethod(HttpMethod.DELETE, ResourceType.ITEM);

		RepositoryInvoker invoker = resourceInformation.getInvoker();
		Optional<Object> domainObj = invoker.invokeFindById(id);

		return domainObj.map(it -> {

			PersistentEntity<?, ?> entity = resourceInformation.getPersistentEntity();

			eTag.verify(entity, it);

			publisher.publishEvent(new BeforeDeleteEvent(it));
			invoker.invokeDeleteById(entity.getIdentifierAccessor(it).getIdentifier());
			publisher.publishEvent(new AfterDeleteEvent(it));

			return new ResponseEntity<Object>(HttpStatus.NO_CONTENT);

		}).orElseThrow(() -> new ResourceNotFoundException());
	}

invoker.invokeFindById(id) retrieves the correct domainobject (line 417)
invoker.invokeDeleteById(entity.getIdentifierAccessor(it).getIdentifier()); (line 426) leads to an error, because "entity.getIdentifierAccessor(it).getIdentifier()" returns only the last "@Id"-annotated entity attribute. I verified this behaviour by changing the attribute order in my entity class. This is a primitive datatype and therefore can not be mapped to MyPkClass.
Maybe "invokeDeleteById()" should be called with "id" like "invokeFindById(id)" ?