Magento 2.2.1- Fullscreen image close button not working iOS

Question

When I click on the close icon on an iphone or ipad nothing happens. Hooked the device up to my iMac to debug and there's no errors in the console. Any suggestions?

Update

As highlighted below this was an issue with the fotorama plugin and fix is currently on the 2.2-develop branch. https://github.com/magento/magento2/pull/13268

Answer 1

A fixed has been commited to magento:2.2-develop branch. This worked for me https://github.com/magento/magento2/pull/13268

Answer 2

Override fotorama.js and replace code as per this solution:- Magento 2 product gallery doesn't close on iPhone