clang-tidy not applying naming - c++

Question

I'm trying to use clang-tidy on Windows from MSVC (Clang 13.0.1 for MSVC 2022 amd). The renaming is applied to the header file, but not fully to the cpp file.
.clang-tidy
Checks: '-*,readability-identifier-naming'
CheckOptions:
- { key: readability-identifier-naming.ClassCase, value: lower_case }
- { key: readability-identifier-naming.ClassMemberCase, value: lower_case }
- { key: readability-identifier-naming.ClassMethodCase, value: lower_case }
- { key: readability-identifier-naming.FunctionCase, value: lower_case }
- { key: readability-identifier-naming.ParameterCase, value: lower_case }
- { key: readability-identifier-naming.VariableCase, value: lower_case }
Header:
#pragma once
class NeedsTidying
{
public:
int addFunc(int argOne, int argTwo);
int subFunc(int argOne, int argTwo) {
return argOne - argTwo;
}
};
cpp:
#include "tidy.hpp"
int NeedsTidying::addFunc(int argOne, int argTwo) {
return argOne + argTwo;
}
clang-tidy arguments: clang-tidy --fix-errors -p build\compile_commands.json path_to_code*
clang-tidy gets applied to the header file as I expect, but the cpp file doesn't apply the class name or method renames as I expect:
int NeedsTidying::addFunc(int arg_one, int arg_two) {
return arg_one + arg_two;
}