If there is a raid at a gym that you are defending, when you view the Pokemon and then press "go to gym", you won't be able to view that gym, and you'll get a message along the lines of "there is a raid currently in progress", but you won't be able to tell what the raid boss is if it's off your screen.
GamePress
Mewtwo
Can you still see "far away" raids in the vicinity of your map if you have a Pokémon defending that gym? If so, is Niantic going to diasable this feature anytime soon? I have a good idea about placing scouts around my city, so I can access more raids.
Btw, that title has nothing to do with the question. But I got your attention, so thank you for reading.