Played a little more last night. As soon as I lose LOS of the UFO then regain it, I get a full UFO again. As soon as someone gains LOS inside the UFO, I get the "Inside view". If I end the turn while not being inside the UFO, but having LOS inside the UFO, I get the botched view the next turn. Stepping inside the UFO resets it to "Inside view".
Should I report this as a bug?