Service_app_exit() not working with Tizen 5.5


until now I used Tizen 3 and 4 with a hybrid app including a native service app. Within the service app the service_app_exit() command is called to terminate it at some point. After upgrading to Tizen 5.5 that command seems not to work anymore (at least on the emulator; I have no real 5.5 device here; also Remote Test Lab does only provide T4.0 watches). The app keeps on running and is only terminated when uninstalled.
Did anyone else observe this behaviour or has a fix for it?

Thank you.