When trying to setup a workflow of type data_object_splitted_state I get the error:

argument "$propertyAccessor" of method "Pimcore\Workflow\MarkingStore\DataObjectSplittedStateMarkingStore::__construct()" references class "Symfony\Component\PropertyAccess\PropertyAccessor" but no such service exists. Try changing the type-hint to "Symfony\Component\PropertyAccess\PropertyAccessorInterface" instead.

Changing this removed the error message and I could continue.