When hyphens ("-") are present in the technical name of the created workflow the following exception is thrown:

ERROR Zend_Cache_Exception: E9999 - Invalid id or tag 'ZfExtended_workflow_definitions_review-with-additional-reminders' : must use only [a-zA-Z0-9_]
in core /var/www/instances-local/instance-xxx/vendor/shardj/zf1-future/library/Zend/Cache.php (209)