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Argument Clinic uses original name of Python parameter in generated code for custom (format code "O&") converter even if the parameter was renamed.
Example:
/*[clinic input]
test
 filename as path: object(converter="PyUnicode_FSConverter")
 /
[clinic start generated code]*/
Generated code:
static PyObject *
test(PyModuleDef *module, PyObject *arg)
{
 PyObject *return_value = NULL;
 PyObject *path;
 if (!PyUnicode_FSConverter(arg, &filename))
 goto exit;
 return_value = test_impl(module, path);
exit:
 return return_value;
}

This is caused by your "meth_o inline" code, which isn't checked in yet. A clean checkout of CPython trunk generates this correct code:
 if (!PyArg_Parse(arg, "O&:test", PyUnicode_FSConverter, &path))
Maybe you don't need to use bugs.python.org as your personal bug tracker; maybe you don't need to add me to your private bugs.

You are right. Sorry for the noise.