Generic type for onServer value in setErrorMap remains undefined

const form = useForm({
        validators: {
            onBlur: TestActionSchema,
        },
        defaultValues: {
            username: "",
            password: "",
            age: 22,
        } as TestActionSchemaType,
        onSubmit: async ({ value, formApi }) => {
            const result = await testAction(value);

            if (!result.success) {
                /* Setting server validation field errors */
                if (result.formErrors) {
                    for (const [key, errors] of Object.entries(result.formErrors)) {
                        formApi.setFieldMeta(key as any, (prev) => ({
                            ...prev,
                            errorMap: {
                                onSubmit: errors ? errors.map((error: string) => ({ message: error })) : undefined,
                            },
                        }));
                    }
                    return;
                }

                /* Setting server error that is accessible from form */
                if (result.serverError) {
                    formApi.setErrorMap({
                        onServer: [result.serverError],
                    });
                    return;
                }
            }

            if (result.success) {
                form.reset();
            }
        },
    });