I don't know. These TBMs have been operating all over the world in every imaginable type of subterranean environment for a very long time now.
I find it hard to believe that they're just now encountering a type of rock or soil condition that they're unprepared to handle. The technology is pretty darned advanced these days.
If, say 1/3 of the face is quartzite and the remainder is sandstone the miner would be pulling continually right or left of its intended direction. It would likely shutdown once it’s alignment is altered.