Invalid parse context in CMake project with source file specific flags

Given the following reduced / self-contained CMake-Project (CMakeLists.txt):

cmake_minimum_required(VERSION 3.27.6)

project(foo)

set(CMAKE_CXX_STANDARD 20)

set(CONTENT [[
	#include <concepts>

	template<typename T>
		concept FooConcept = requires(T foo)
	{
		foo.bar();
	};
]])

file(WRITE foo.hpp "${CONTENT}")
file(WRITE foo.cpp "#include \"foo.hpp\"")
file(WRITE bar.c "void bar() {}")

add_library(foo SHARED foo.cpp bar.c foo.hpp)

set_property(SOURCE bar.c
	APPEND
	PROPERTY COMPILE_OPTIONS
		-fno-fast-math
)

Opening foo.hpp in the IDE generates (among others) the code model error:

Unknown type name 'concept'

Inspecting the code models I see three contexts.

I am not sure why three (I would have understood two).

The context (which in my case is used by default) that presumably causes the issue lists the compiler flags:

-g -fPIC -fno-fast-math

Another context (which works correctly if selected manually) lists the flags:

-DQT_QML_DEBUG -g -std=gnu++20 -fPIC

A third context is for "C" and does not apply to foo.hpp.

I would assume that the first context should not exist at all or should also include the `-std=gnu++20` flag.