Randomly this doesn't support all entities. like 
 etc See https://dev.w3.org/html5/html-author/charref for a list of others. This is even brought up in the code: https://github.com/SpiderLabs/ModSecurity/blob/caadf97524a4861456be176a8cb91dcbb76b97e4/apache2/msc_util.c#L1844