Shared pointer convertible to base class ONLY if directly inherits the base class

A Function which takes QSharedPointer<BaseClass> as an argument, only classes which directly inherit BaseClass seem to be properly converted.

So in a nutshell:

class ClassA : public BaseClass {}; //This would be properly converted

class ClassB : public ClassA {}; //This would NOT be properly converted

pointer to ClassA could be passed into the function successfully but pointer to ClassB would result in an error.

Steps to reproduce the problem:

• Build the attached project
  • cmake --build <path_to_src> -DCMAKE_PREFIX_PATH=<path_to_qt>
  • cmake --install <build_dir>
• Run the main.py

NOTE: this can be reproduced with 5.15.9 as well but the version can't be selected.