Clang searching for header in wrong place

Question

I've tried to run my project, but it's complaining about not being able to find a header. The reason it can't find it is because instead of searching my ./include directory, it's loading a framework from somewhere in XCode.

/Users/liam/CLionProjects/Game/Game/../Engine/Engine/Platform/MacOS/WindowService/WindowMetal.h:7:10: fatal error: 'Metal/Metal.hpp' file not found
    7 | #include <Metal/Metal.hpp>
      |          ^~~~~~~~~~~~~~~~~
/Users/liam/CLionProjects/Game/Game/../Engine/Engine/Platform/MacOS/WindowService/WindowMetal.h:7:10: note: did not find header 'Metal.hpp' in framework 'Metal' (loaded from '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.2.sdk/System/Library/Frameworks')

This is what my CMake file looks like

cmake_minimum_required(VERSION 3.30)
project(Engine)

set(CMAKE_CXX_STANDARD 26)

add_library(Engine SHARED
        /* FILES */
)

target_include_directories(Engine PRIVATE
        ../Engine
        Core/pch
        ../include/Common
)

if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
    target_include_directories(Engine PRIVATE
            ../include/Windows
    )
elseif (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
    target_include_directories(Engine PRIVATE
            ../include/Apple
    )
endif()

if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
    target_link_libraries(Engine PRIVATE
            dwmapi
    )
elseif (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
    target_link_libraries(Engine PRIVATE
            "-framework Metal"
            "-framework MetalKit"
            "-framework AppKit"
            "-framework Foundation"
            "-framework QuartzCore"
    )
endif()

The Metal directory exists in ../include/Apple

I've created a seperate cmake project like so

cmake_minimum_required(VERSION 3.30)
project(mac_window)

set(CMAKE_CXX_STANDARD 26)

add_executable(mac_window src/main.cpp)

target_include_directories(mac_window PRIVATE include)
target_link_libraries(mac_window PRIVATE
        "-framework Metal"
        "-framework MetalKit"
        "-framework AppKit"
        "-framework Foundation"
        "-framework QuartzCore"
)

And it works fine. What's the difference?