URL Parameter sap-client is not applied for the application C4RE

In C4RE Location Management, we embed an Iframe with a FIORI App that has a Backend Conncection to an on-premise System.

When including the parameter sap-client in the C4RE launchpad URL, this sap-client parameter should be forwarded to all backend Calls, but this is not the case.The idea is, that we can refer to another backend client simply by changing the Launchpad URL.

The on-premise system is a NetWeaver 750 EhP 8, that we connect via Cloud Connector.