I wanted to report on a silent error not reported during build , but only at runtime.
The signal handler functions name must match the signal name, and of course with first letter capitalized.

If you want to reproduce the error yourself, the code used is in the repository for C++ Integration course https://github.com/qt-learning/QML-Integration-Intermediate/tree/main - Section 4 or Section 5.

The other post mentioning the error has another dynamic issue, mine could be solved by just renaming the function.

Cheers, DSU