The keyword constexpr is not highlighted

[24bit-xjkp]

Checklist

• [x] This problem exists even with the setting "C_Cpp.enhancedColorization": "Disabled"

The code with a problem is:

int main()
{
    constexpr std::size_t highlight{};
    const ::std::size_t highlight2{};
    ::std::size_t const highlight3{};
    ::std::size_t constexpr highlight4{};
    constexpr ::std::size_t no_highlight{};
}

It looks like:

It should look like:

The keyword constexpr should be highlighted.