"hidden" attribute is not getting applied with beta.5

[affair]

I tried example from demo folder

<link rel="import" href="../bower_components/paper-stepper/paper-stepper.html">

<paper-stepper linear>
    <paper-step label="step 1"></paper-step>
    <paper-step label="step 2"></paper-step>
    <paper-step label="step 3" editable></paper-step>
    <paper-step label="step 4"></paper-step>
</paper-stepper>

Beta.4 result

Beta.5 result