install components from directories marked EXCLUDE_FROM_ALL still populate COMPONENTS, breaking CPack WIX generator.

Given the following snippet, where lib1 and lib2 are projects that declare install targets:

add_subdirectory(lib1 EXCLUDE_FROM_ALL)
add_subdirectory(lib2 EXCLUDE_FROM_ALL)

add_executable(myapp main.cpp)
target_link_libraries(myapp PRIVATE lib1 lib2)
install(TARGETS myapp
    CONFIGURATIONS Release
    RUNTIME DESTINATION bin
    COMPONENT myapp_Runtime
)

get_cmake_property(LIST_OF_COMPONENTS COMPONENTS)
message("DEBUG: Component List: ${LIST_OF_COMPONENTS}")

Assuming both lib1 and lib2 are defining their install targets with component names the output will be DEBUG: Component List: lib1;lib2;myapp_Runtime

I expected the output to be DEBUG: Component List: myapp_Runtime since all install targets are in directories marked EXCLUDE_FROM_ALL, specifically to avoid those install targets leaking into my application. cmake --install . works as expected but if I then try to package this program:

set(CPACK_PACKAGE_NAME wc-programmer)
set(CPACK_VERBATIM_VARIABLES YES)
include(CPack)
message("DEBUG: CPack Component List: ${CPACK_COMPONENTS_ALL}")

the output is again DEBUG: CPack Component List: lib1;lib2;myapp_Runtime

This causes the CPack WIX generator to fail (and I suspect other similar generators?) since the number of components is > 1, but most are empty.

CPack Error: Problem running WiX candle. Please check 'C:/Users/name/myapp/cmake-build-release/_CPack_Packages/win32/WIX/wix.log' for errors.
CPack Error: Fatal WiX Generator Error
CPack Error: Problem compressing the directory
CPack Error: Error when generating package: myapp

with the relevant error in wix.log:

error LGHT0091 : Duplicate symbol 'Component:CM_C_EMPTY_INSTALL_ROOT' found. This typically means that an Id is duplicated. Check to make sure all your identifiers of a given type (File, Component, Feature) are unique.

files.wxs contains the following, clearly showing the duplicate components:

<DirectoryRef Id="CM_DP_Unspecified.bin">
    <Component Id="CM_CP_Unspecified.bin.wc_programmer.exe" Guid="*">
        <File Id="CM_FP_Unspecified.bin.wc_programmer.exe" Source="C:/Users/Ethan/working/wc-comm/cmake-build-release/_CPack_Packages/win32/WIX/wc-programmer-0.1.0-win32/Unspecified/bin/wc-programmer.exe" KeyPath="yes"/>
    </Component>
</DirectoryRef>
<DirectoryRef Id="INSTALL_ROOT">
    <Component Id="CM_C_EMPTY_INSTALL_ROOT" Guid="FA0B26C2-E168-4D82-89F6-638E24126BB0">
        <CreateFolder/>
    </Component>
</DirectoryRef>
<DirectoryRef Id="INSTALL_ROOT">
    <Component Id="CM_C_EMPTY_INSTALL_ROOT" Guid="71E9C0B9-8009-4A5D-9A05-CA7AAF1E69E7">
        <CreateFolder/>
    </Component>
</DirectoryRef>

It seems like the components from install commands in directories marked EXCLUDE_FROM_ALL shouldn't be in COMPONENTS. If that is expected behavior for some reason then the WIX generator should be able to handle this.