Steps to reproduce
1.- Start Liferay
2.- Add a Web Content Display
3.- Regarding the WCD, go to Configuration --> Supported Clients
4.- Uncheck the option for mobile devices.
6.- Access to that page with a non-wap mobile device (smartphone, tablet, ...)
You can not see the WCD portlet
You can see the portlet
This issue is not reproducible in master because this option (WCD Portlet --> Configuration --> Supported Clients) was removed.