I've seen a few threads on other sites bringing this to light, but nothing posted recently or any sort of solution. Essentially I've modified the standard Neutral Flag game type into a custom One Flag mode and made it visible if anyone searches for it using the content browser, yet it doesn't seem to show up. Has anyone solved this or seen a response from 343?
I believe 343 are working on a fix, they just haven't fixed the functionality of the new gametype. We should see this fixed by the next update.