I was able to replicate via the following steps:
1) Start up Elasticsearch, Zeebe Broker, and Operate
2) Using Zeebe CLI, deploy the attached BPMN model asset.bpmn (on a mac: `./bin/zbctl.darwin deploy asset.bpmn`)
3) In Operate, click on Running Instances
4) Select `asset` from the Workflows dropdown
Fabian Hinsenkamp, I assigned to you for now. Let me know if you have questions or if we need to get in touch with the user.