Code model doesn't respect c++ standard in cmake project

This bug is only reproducible on Windows MSVC, I tried it now on Linux and there it works like expected.

I have created New Project - Library - C++ library ( shared ), it is practically the default library cmake project.

I have changed the standard to 20:

set(CMAKE_CXX_STANDARD 20)

I pasted this code to the cpp file: 

#include <type_traits>
namespace Orm::Query
{}
template<typename T>
concept Queryable = std::convertible_to<T, int> ||
                    std::invocable<T, int>;

 And I get errors and warnings from the code model.

If the code model doesn't respect the selected c++ standard then it can be assumed that it doesn't respect CMAKE_CXX_EXTENSIONS too.

Used example project:

library_cmake.zip

Main CMakeLists.txt file:

cpp file content:

And errors and warnings views:

As another proof the same works in the qmake project, here is the same example as the qmake project:

library_qmake.zip

Open library_qmake.pro and uncomment CONFIG += c++11 and also comment #CONFIG += c++2a, by this you select c++11 standard and you get exactly the same errors and warnings as I have reported above. So it is absolutely clear that QtCreator doesn't set up the underlying library correctly. ( I don't know what is used to obtain warnings and errors by the Code Model, I'm guessing libclang? )