Using Platforms causes dark lighting on part of ceiling

I want to add on to this.

I don't know if there's another bug report, but platforms also make a dark spot on higher levels depending where a room is drawn.

Here's some pictures:

only one saucer light

the room below it. The dark spot is where the wall is drawn below it.

more lights to make it better, but it's still visible

I've also had this occur on many occasions 😭