Now breaks cornerstone effects

It appears that the latest update (seems to be, I don’t 100% know) breaks attributes which had JSON stored in them. Cornerstone uses these for effects. This means that large swathes of our site no longer work. For example:

On our dev site:

<div class="x-text x-text-headline e1053-e91 mt9-4h mt9-4i mt9-4j mt9-4k mt9-4l mt9-4m mt9-4p mt9-4q mt9-4r mt9-4s mt9-4t mt9-4u mt9-4v mt9-i mt9-j x-effect-enter x-effect-animated" data-x-effect="{&quot;scroll&quot;:true,&quot;offsetTop&quot;:&quot;10%&quot;,&quot;offsetBottom&quot;:&quot;10%&quot;,&quot;behaviorScroll&quot;:&quot;fire-once&quot;,&quot;animationEnter&quot;:&quot;fadeIn&quot;,&quot;animationExit&quot;:&quot;rollOut&quot;}" style=""><div class="x-text-content"><div class="x-text-content-text"><h2 class="x-text-content-text-primary">Deliver better visitor experiences</h2></div></div></div>

But once exported, the data-x-effect attribute simply has an open brace and nothing else:

<div class="x-text x-text-headline e1053-e91 mt9-4h mt9-4i mt9-4j mt9-4k mt9-4l mt9-4m mt9-4p mt9-4q mt9-4r mt9-4s mt9-4t mt9-4u mt9-4v mt9-i mt9-j x-effect-exit" data-x-effect="{" scroll=""><div class="x-text-content"><div class="x-text-content-text"><h2 class="x-text-content-text-primary">Deliver better visitor experiences</h2></div></div></div>

The page I need help with: [log in to see the link]