We have encountered a wierd issue that when calling inherited cpp method of a qml singleton, the app crash with assert failure:

ASSERT: "wrapper" in file C:\Users\qt\work\qt\qtdeclarative\src\qml\jsruntime\qv4qobjectwrapper.cpp, line 2472

I attach a minimal example that can reproduce the issue.

Also note that if I remove arguments from MyTest.helloWorld method, then the app works fine.

// remove arguments will not cause assert failure then
function helloWorld() {
   console.log("*** hello world")
}