When using the First, Executive Platinum, etc. access to security they scan your boarding pass. It is also the point at which you are directed to TSA PreCheck. The segment was not opened or changed.

All Cathay issued boarding passes would not scan. All passengers were directed back to the counter to obtain a new boarding pass. Universal standard or not, the CX issued boarding passes did not work. Simple choice, get a new boarding pass or don't fly.

I know ground handling is contracted. The issue remains that it is an element of CX service which impacts customer service. Long delays and failure to deliver premium passenger bags in a timely manner is not good for business.