I had that same bug with pitch black shadows in Stadium in TM1. Like, it was totally black. I remember specifically on some dirt maps I had that bug. Because of that, and other maps with badly placed lighting in TM1... I also turned off lightmaps in the launcher settings very early in my TM playing. It also made RPGs easier to drive (when those eventually came along), cause you could see where you were going in those dark corridors.
I did miss the ability to do that when I moved to TM2. Thankfully Canyon has like a gazillion light blocks, so it actually opened up a lot of new possibilities. But you really do have to have a screaming fast machine to take full advantage of it, cause you need to compute shadows over and over as you build your map, to test how the lighting is looking. I often compute shadows at least 10 to 15 times during the building process. It usually only takes 20 to 40 secs per compute on fast quality, or a bit longer on default quality.