Duplicate Errors when using same Schema for onChange and onMount validation

const simpleFormSchema = z.object({
  firstName: z.string().min(4, "must be longer than 4 characters"),
  lastName: z.string().min(4, "must be longer than 4 characters"),
});

const simpleFormOptions = formOptions({
  defaultValues: {
    firstName: "",
    lastName: "",
  },
  validators: {
    onMount: simpleFormSchema,
    onChange: simpleFormSchema,
  },
});

  validators: {
    onMount: simpleFormSchema,
    // onChange: simpleFormSchema,
    onChange: ({ value, formApi }) => {
      const errors = simpleFormSchema["~validate"](value);
      formApi.setErrorMap({
        onMount: null,
        onChange: errors
      });
    },
  },