**Do you want to request a *feature* or report a *bug*?**
Bug

**What is the current behavior?**
I've started recieving this warning about my SVGs which is using [feGaussianBlur](https://developer.mozilla.org/en-US/docs/Web/SVG/Element/feGaussianBlur): 
`Warning: Expected server HTML to contain a matching <feGaussianBlur> in <filter>.`

**What is the expected behavior?**
Should be no warnings because there are no difference.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
Such behavior started right after updating to `React 16.0.0-rc.3` and never happened with `React 15.6.1`
/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @providesModule ReactDOMFiberEntry
 * @flow
 */
'use strict';
import type {ReactNodeList} from 'ReactTypes';
require('checkReact');
var DOMNamespaces = require('DOMNamespaces');
var ExecutionEnvironment = require('fbjs/lib/ExecutionEnvironment');
var ReactBrowserEventEmitter = require('ReactBrowserEventEmitter');
var ReactControlledComponent = require('ReactControlledComponent');
var ReactDOMComponentTree = require('ReactDOMComponentTree');
var ReactDOMFeatureFlags = require('ReactDOMFeatureFlags');
var ReactDOMFiberComponent = require('ReactDOMFiberComponent');
var ReactDOMFrameScheduling = require('ReactDOMFrameScheduling');
var ReactGenericBatching = require('ReactGenericBatching');
var ReactFiberReconciler = require('ReactFiberReconciler');
var ReactInputSelection = require('ReactInputSelection');