The problem is related to URL structure and the fact that the suffix for the original resource (/etc/cloudsettings.kernel.js/conf/xxx/settings/cloudsettings/default/contexthub) does not have any extension. Dispatcher ignores such requests. Sadly, It looks like a dead end... However, with a bit of trick you can force the dispatcher to cache it. If you name your contexthub configuration in a way which ends with an extension, i.e. /conf/xxx/settings/cloudsettings/default/contexthub.js, then the ful...

I see this issue for one of our customer on 6.5.8 as well, not sure if this was fixed. (the release notes says it was in 6.5.7 but seems to occur in AEM 6.5.8)