Form validation ignored when adding a perch:error tag to output class

Hey,

I seem to have ran into an issue when adding a <perch:error> tag to output a class on an element. When added, form validation seems to be bypassed and the form is processed successfully even when missing required fields are present. When removed the form validates as it should and outputs the error messages.

I have pinned the difference down to class="input input--required<perch:error for="name" type="required"> input--error</perch:error>"

Not working:

<perch:form method="post" id="contact" app="perch_forms" prefix="none" class="contact-form" autocomplete="off">
  <perch:error for="all" type="general">
      <div class="response">
        <div class="alert alert--error">
            <p>Sorry, something went wrong and the form was not sent. Please see the messages below.</p>
            <button class="alert-button" aria-label="Close" data-dismiss="alert"><span aria-hidden="true">×</span></button>
        </div>
      </div>
  </perch:error>

  <div class="field">
    <perch:label for="name" class="form-label">Name</perch:label>
    <perch:input id="name" type="text" label="Name" antispam="name" mailer="name" class="input input--required<perch:error for="name" type="required"> input--error</perch:error>" placeholder=" " required="true" />
    <perch:error for="name" type="required"><p class="form-help form-help--error">Name is required</p></perch:error>
  </div>

  <div class="form-action">
    <perch:input type="cms" />
    <button id="submit" type="submit" name="submit" class="btn btn-large btn-block">Send Message</button>
  </div>

  <perch:success>
  <div class="response">
    <div class="alert alert--success">
        <p>Thank You! - Your enquiry has been sent</p>
        <button class="alert-button" aria-label="Close" data-dismiss="alert"><span aria-hidden="true">×</span></button>
    </div>
  </div>
  </perch:success>
</perch:form>

Working:

<perch:form method="post" id="contact" app="perch_forms" prefix="none" class="contact-form" autocomplete="off">
  <perch:error for="all" type="general">
      <div class="response">
        <div class="alert alert--error">
            <p>Sorry, something went wrong and the form was not sent. Please see the messages below.</p>
            <button class="alert-button" aria-label="Close" data-dismiss="alert"><span aria-hidden="true">×</span></button>
        </div>
      </div>
  </perch:error>

  <div class="field">
    <perch:label for="name" class="form-label">Name</perch:label>
    <perch:input id="name" type="text" label="Name" antispam="name" mailer="name" class="input input--required" placeholder=" " required="true" />
    <perch:error for="name" type="required"><p class="form-help form-help--error">Name is required</p></perch:error>
  </div>

  <div class="form-action">
    <perch:input type="cms" />
    <button id="submit" type="submit" name="submit" class="btn btn-large btn-block">Send Message</button>
  </div>

  <perch:success>
  <div class="response">
    <div class="alert alert--success">
        <p>Thank You! - Your enquiry has been sent</p>
        <button class="alert-button" aria-label="Close" data-dismiss="alert"><span aria-hidden="true">×</span></button>
    </div>
  </div>
  </perch:success>
</perch:form>

Perch Runway: 3.0.12, PHP: 7.0.6, MySQL: 5.5.57, with PDO Server OS: Linux, cgi-fcgi Installed apps: content (3.0.12), assets (3.0.12), categories (3.0.12), perch_forms (1.10), chirp_seo (1.2.1), redfinch_logger (1.0.1), boldr (1.0), perch_twitter (4.0) App runtimes: <?php $apps_list = [ 'perch_forms', 'perch_twitter', 'chirp_seo', 'boldr' ]; PERCH_LOGINPATH: /cms PERCH_PATH: /nfs/c12/h06/mnt/216239/domains/chestnuts.madebyboldr.co.uk/html/cms PERCH_CORE: /nfs/c12/h06/mnt/216239/domains/chestnuts.madebyboldr.co.uk/html/cms/core PERCH_RESFILEPATH: /nfs/c12/h06/mnt/216239/domains/chestnuts.madebyboldr.co.uk/html/cms/assets Image manipulation: GD PHP limits: Max upload 99M, Max POST 99M, Memory: 99M, Total max file upload: 99M F1: 3b606135b33e6a102526838f4152a807 Resource folder writeable: Yes SCRIPT_NAME: /cms/core/settings/diagnostics/index.php REQUEST_URI: /cms/core/settings/diagnostics/ DOCUMENT_ROOT: /home/216239/domains/chestnuts.madebyboldr.co.uk/html HTTP_HOST: chestnuts.madebyboldr.co.uk