Breaks autosubmit for Views exposed filters

In Views, in the "Exposed form" > "Exposed form style" settings, you can select "Autosubmit". This stops working when the Gumby theme is enabled.

Perhaps the problem could lie here, although I'm not certain:

If you look at the HTML of the exposed form and compare it to that with Bartik's, you find hyphens are missing.

1. The class is "form-submit" with Bartik but is "form submit" with Gumby:

<div class="ctools-use-ajax ctools-auto-submit-click btn medium rounded info form submit" id="edit-submit-articles" name="" value="Apply" type="submit">

2. The class is "form-item-flagged-2" with Bartik but is "form-item flagged-2" with Gumby:

<div class="form-type select form-item flagged-2 field form-group"><div class="picker">....