My guess is Realms may be down right now... but still this bug applies because the game should not be crashing when it cannot connect to realms. It should gracefully give an error message.
Sorry, it has been ages since I submitted this ticket or really was involved in the minecraft bug tracker. This was submitted on my old account.
Anyways, I'd like to try to test this, but so far "Commands Only" on my regular multiplayer server just shows all the chat regardless of whether it's a command or not, and I'm not sure how I'd go about helping to test this. Maybe it's because of the way the server handles chat messages, or it could actually be a bug....
Yeah I'm disappointed the mod here is so dismissive. I have a broken portal I built EIGHT HUNDRED BLOCKS away from another overworld portal. I go in and it sends me to that portal's location.