dev-develop changes rendering, functional tests

[truckee]

In version 2.2,

    <div class="col-md-2">
        {{ form_row(form.center) }}
    </div>

is rendered as

<div class="form-group"><label class="control-label" for="household_center">Site:</label><select     id="household_center" name="household[center]"         disabled="disabled" class="form-control"><option  value="">Select site</option><option value="819">Incline Village</option><option value="817" selected="selected">Kings Beach</option><option value="816">Tahoe City</option><option value="818">Truckee</option></select></div>

after getting rid of the deprecation notice by requiring dev-develop the same code is rendered as

<div class="form-group"><label class="control-label" for="household_center">Site:</label><select     id="household_center" name="household[center]"         disabled="disabled" class="form-control"><option  value="">Select site</option><option value="607"
                                                    >
                    Incline Village
                </option><option value="605"
                         selected="selected"                            >
                    Kings Beach
                </option><option value="604"
                                                    >
                    Tahoe City
                </option><option value="606"
                                                    >
                    Truckee
                </option></select></div>
            </div>

This causes a functional test based on $crawler->filter("#household_center option:selected")->text() to fail. It is, of course, easy to fix the test with trim($crawler->filter("#household_center option:selected")->text()). I would not, however, expect that a non-development version, should one become available without the deprecation notice, would cause tests to fail. Is there some reason why rendering must change?