With the addition of required active light sources to rooms, there appear to be problems wherein the game doesn't know whether a room really is a room (and doesn't even necessarily agree with itself). A specific example, if you have a latrine and add a light on a switch (turning it into a washroom), turning the light on and then off leaves the "room-ness" of the room in an uncertain state -- the rooms overlay still says the room is a washroom, but also reports the lack of light as a problem, leaving it unclear to the player whether they're getting the bonus for the washroom or not.
1. Build a room that counts as a latrine 2. Add a light to the room that's not connected to anything [observe: the room is still a latrine] 3. connect the light to a switch and that switch to power, with the switch turned 'on' [observe: the room is now a washroom] 4. turn the switch off [observe: the room is still a washroom, but the tooltip in the room overlay lists the light requirement in red and it is unclear whether it really is a washroom]