Including headers from a sub-framework

My code just has #include <Accelerate/Accelerate.h>, to which Intellisense gives the error cannot open source file "cblas.h"
I have the macFrameworkPath set to the same as you posted above and that helps resolve all the frameworks I'm using in this project (CoreFoundation, CoreAudio, Accelerate).

I have also tried adding the sub-framework to macFrameworkPath like
"/Applications/Xcode.app/Contents/Developer//Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks"
hoping that would help but it didn't.

My entire c_cpp_properties is

{
    "configurations": [
        {
            "name": "Mac",
            "includePath": [
                "/Users/lucianthorr/dev/myproject/**",
                "/Applications/Xcode.app/Contents/Developer//Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Headers"
            ],
            "defines": [],
            "macFrameworkPath": [
                "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks"
            ],
            "cStandard": "c11",
            "cppStandard": "c++17",
            "intelliSenseMode": "macos-clang-arm64",
            "mergeConfigurations": false,
            "compilerPath": "/usr/bin/clang",
            "browse": {
                "limitSymbolsToIncludedHeaders": true,
                "path": [
                    "${workspaceFolder}/**"
                ]
            }
        }
    ],
    "version": 4
}

Originally posted by @lucianthorr in https://github.com/microsoft/vscode-cmake-tools/issues/3094#issuecomment-1502105234

Start by reproducing the Accelerate/Accelerate.h include failure with the supplied c_cpp_properties configuration, then trace how macFrameworkPath resolves the nested vecLib.framework/Headers path. Done means IntelliSense resolves cblas.h without requiring an additional manual include path.