On staging environment we sometimes face the situation that the demo data is not shown. The logs are clean and don't show any unexpected exceptions.
My assumption is that data is generated on Zeebe (we see it in logs), but the import is not started. Possible reason is this line of code:
When Operate and Zeebe are started at the same moment it can happen, that the received partition list was empty. Probably we need to retry at this moment.