Orders with äöüÄÖÜ in the order id can not be handled by JOC

Current Situation

It is possible to create orders with üöäÄÖÜ in the order id. For example when a filename contains such characters and will be consumed by a file order source or simply by editing with JOC. 

Such orders can not be handled by JOC Cockpit. They can not be started, resumed or anything else. 

The error message is 

Server returned HTTP response code: 400 for URL: http://host:40444/jobscheduler/master/api/command 

With the rest api interface it is possible to handle those orders e.g. to start them with ./orders/start

{"orders":[{"orderId":"ä","jobChain":"/path/jobchain","at":"now"}],"jobschedulerId":"scheduler_joc_cockpit"}

has the result

{
    "deliveryDate": "2019-07-31T10:01:33.962Z",
    "ok": true,
    "surveyDate": "2019-07-31T10:01:33.954Z"
}

and the order will be started

Desired Behavior

It should be possible to handle Orders with äöüÄÖÜ in the order id with JOC Cockpit.

Reproduce

In the attached file there is a configuration with a job chain and a persistent order with the order id ä. This configuration has been created with JOE. The JobScheduler Master accepts this configuration but it is not possible to start the order ä. With the rest web service it is possible to start the order.