Refactoring does not work after function with constexpr if

If I define a function with a particular constexpr if (C++17), all refactoring options like Find references to symbol, F2, and renaming doesn't work for the functions declared/defined after it.

void fn()
{
    if constexpr (std::is_integral<int>::value)
    {
        int i;
    }
}

If I put the whole definition in a header file, it breaks all functions declared/defined after it. If I put the declaration in the header and the definition in the cpp file, it breaks all functions after the definition.

If I comment out constexpr, everything works.

If I comment out  int i, everything works.

If i use  if constexpr (true), it also works.