Environment

• OS and Version: Linux x64 5.15.0-113-generic snap
• VS Code Version: 1.91.1
• C/C Extension Version: v1.20.5
• If using SSH remote, specify OS of remote machine: No

Bug Summary and Steps to Reproduce

Bug Summary:
Outline miss some symbols if the test.h has macro define,
if I delete the macro define "#ifdef __cplusplus" , all Symbols will show in the outline
test.zip

Steps to reproduce:

1. open test.h with VS Code
2. not all symbols in outline

Expected behavior:
show all symbols in outline

Configuration and Logs

{
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "${workspaceFolder}/**"
            ],
            "defines": [],
            "compilerPath": "/usr/bin/clang",
            "cStandard": "c17",
            "cppStandard": "c  14",
            "intelliSenseMode": "linux-clang-x64"
        }
    ],
    "version": 4
}

Other Extensions

No response

Additional context

No response