The qtlicd gets stuck when compiling a lot of examples on a row

RTA example tests on macOS and linux keep getting stuck when compiling all the Qt examples (not parallel, but one by one). Sometimes log has:
AutoMoc: License service not running, attempting startup

sometimes last log print is just debug log of the configure/build command, sometimes the java process has crashed all the sudden aborting the whole test execution.

Affects all linux and macOS configurations.