file qstatemachine.cpp, line 1443: GoToStateTransition trans = qFindChild<GoToStateTransition>(sourceState);
the function qFindChild should match only the GoToStateTransition type, but it actually matches any QAbstractTransition type due to
the the absence of Q_OBJECT macro in the GoToStateTransition class to contain its complete meta object info;

this crashes the whole statemachine structure (disconnects the other transitions)