Only once have I seen anything like this. The room had a bathroom door, but also a giant hole cut out in the wall so that everyone in the room could peer into the bathroom for some reason. We demanded a different room with a complete wall separating the bathroom and got one (a nicer one at their expense too).

The Brookstreet Hotel in Kanata (just outside Ottawa), Ontario has bathrooms with windows in them.

There's a shade inside the glass, but still... did I really need to open the blinds to my bathroom?

https://www.brookstreethotel.com/rooms/double-queen