diff --git a/tools/cmakev2/build.cmake b/tools/cmakev2/build.cmake
index 1017154a771..102a94af1c2 100644
--- a/tools/cmakev2/build.cmake
+++ b/tools/cmakev2/build.cmake
@@ -90,12 +90,7 @@ function(idf_build_get_property variable property)
     cmake_parse_arguments(ARG "${options}" "${one_value}" "${multi_value}" ${ARGN})
 
     if("${property}" STREQUAL BUILD_COMPONENTS)
-        # BUILD_COMPONENTS is populated by the Build system v1 compatibility
-        # shim; reject only when running as a native Build system v2 project.
-        idf_build_get_property(_v1_compat __V1_COMPAT_SHIM)
-        if(NOT _v1_compat)
-            idf_die("Build property 'BUILD_COMPONENTS' is not supported")
-        endif()
+        idf_die("Build property 'BUILD_COMPONENTS' is not supported")
     endif()
 
     set(genexpr)
diff --git a/tools/cmakev2/project.cmake b/tools/cmakev2/project.cmake
index ab8579459c7..f431092e811 100644
--- a/tools/cmakev2/project.cmake
+++ b/tools/cmakev2/project.cmake
@@ -923,29 +923,12 @@ function(__project_default)
     set(project_elf "${executable}" PARENT_SCOPE)
 
     # Provide Build system v1-compatible build properties so that existing
-    # test apps and project CMakeLists.txt files that query EXECUTABLE or
-    # BUILD_COMPONENTS continue to work when built through the shim.
+    # test apps and project CMakeLists.txt files that query EXECUTABLE
+    # continue to work when built through the shim.
     idf_build_get_property(v1_compat __V1_COMPAT_SHIM)
     if(v1_compat)
         idf_build_set_property(EXECUTABLE "${executable}")
         idf_build_set_property(EXECUTABLE_NAME "${executable}")
-
-        # BUILD_COMPONENTS: in Build system v1 this is the set of components
-        # actually processed during the build (COMPONENTS + their transitive
-        # REQUIRES within the restricted scope). Use LIBRARY_COMPONENTS_LINKED
-        # from the Build system v2 library target which reflects the actual
-        # list of components linked, plus the architecture component which
-        # Build system v1 always includes but Build system v2 does not track
-        # as a linked library.
-        get_target_property(library ${executable} LIBRARY_INTERFACE)
-        if(library)
-            idf_library_get_property(linked_components "${library}" LIBRARY_COMPONENTS_LINKED)
-            idf_build_get_property(target_arch IDF_TARGET_ARCH)
-            if(target_arch AND NOT target_arch IN_LIST linked_components)
-                list(APPEND linked_components ${target_arch})
-            endif()
-            idf_build_set_property(BUILD_COMPONENTS "${linked_components}")
-        endif()
     endif()
 
     if(CONFIG_APP_BUILD_GENERATE_BINARIES AND TARGET idf::esptool_py)
diff --git a/tools/test_build_system/buildv2/test_migration.py b/tools/test_build_system/buildv2/test_migration.py
index e6eed42f6f1..328149a7499 100644
--- a/tools/test_build_system/buildv2/test_migration.py
+++ b/tools/test_build_system/buildv2/test_migration.py
@@ -118,3 +118,24 @@ def test_build_components_not_available(idf_py: IdfPyFunc) -> None:
     check_file = Path('build/build_components_check.txt')
     assert check_file.exists(), 'Variable check file should be written before the fatal error'
     assert check_file.read_text().strip() == 'NOT_FOUND', 'BUILD_COMPONENTS variable should not be available in v2'
+
+
+@pytest.mark.usefixtures('test_app_copy')
+def test_build_components_rejected_through_shim(idf_py: IdfPyFunc) -> None:
+    """BUILD_COMPONENTS must be rejected even when building through the compatibility shim."""
+    logging.info('Testing BUILD_COMPONENTS rejection through the compatibility shim')
+
+    # Arm the shim via the v1 project.cmake, then query BUILD_COMPONENTS before the graph is configured.
+    Path('CMakeLists.txt').write_text(
+        'cmake_minimum_required(VERSION 3.22)\n'
+        'include($ENV{IDF_PATH}/tools/cmake/project.cmake)\n'
+        'idf_build_get_property(_bc BUILD_COMPONENTS)\n'
+        'project(build_test_app)\n'
+    )
+
+    result = idf_py('reconfigure', check=False)
+
+    assert result.returncode != 0, 'reconfigure must fail when BUILD_COMPONENTS is queried through the shim'
+    combined = (result.stdout or '') + (result.stderr or '')
+    assert 'BUILD_COMPONENTS' in combined, 'Error output must mention BUILD_COMPONENTS'
+    assert 'not supported' in combined.lower(), 'Error output must state that BUILD_COMPONENTS is not supported'