"Go to Definition/Declaration" don't work correctly with the function parameters of a `std::function`

Bug type: Language Service

Describe the bug

• OS and Version: Arch Linux, kernel: 5.10.39-1-lts
• VS Code Version: 1.56.2
• C/C++ Extension Version: v1.4.0-insiders3
• Other extensions you installed (and if the issue persists after disabling them): I don't have other enabled extensions from the "C++" category

When I perform the "Go To Definition" or "Go to Declaration" action on a parameter of the function signature in a std::function type, VSCode navigates to the definition/declaration of std::function in the standard library instead of the actual type definition/declaration. Strangely enough, these actions work properly with the return type of the signature.

Steps to reproduce

1. Copy the code sample into a .cpp file.
2. Right click on the foo inside the parentheses and choose either Go to Definition or Go to Declaration.
3. Observe that VSCode navigates either to the definition of std::function (if Go to Definition was used) or to its declaration.

Expected behavior

VSCode should navigate to the definition of foo within the same file.

Code sample and logs

• Code sample

#include <functional>

struct foo
{
    int bar;
};

using baz = std::function<foo(foo)>;

int main()
{
    return 0;
}

• Logs from running C/C++: Log Diagnostics from the VS Code command palette

-------- Diagnostics - 5/26/2021, 10:46:45 AM
Version: 1.4.0-insiders3
Current Configuration:
{
    "name": "Linux",
    "includePath": [
        "${workspaceFolder}/**"
    ],
    "defines": [],
    "compilerPath": "/usr/bin/clang",
    "cStandard": "c17",
    "cppStandard": "c++14",
    "intelliSenseMode": "linux-clang-x64",
    "compilerPathIsExplicit": true,
    "cStandardIsExplicit": true,
    "cppStandardIsExplicit": true,
    "intelliSenseModeIsExplicit": true,
    "compilerArgs": [],
    "browse": {
        "path": [
            "${workspaceFolder}/**"
        ],
        "limitSymbolsToIncludedHeaders": true
    }
}
No active translation units.

------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 52380
Number of files parsed: 6413

Riproduci il problema usando l'esempio .cpp fornito in VS Code con l'estensione C/C++; inizia con Go to Definition o Go to Declaration su foo all'interno di std::function<foo(foo)>. Il lavoro è completato quando entrambe le azioni navigano alla definizione di foo nello stesso file invece che a std::function.