As for the beams. The first time I got the bug with the long beam that is next to the first mine field. Sometimes when I came to this room it just kept showing the ON animation though I could pass if lucky :)
Then I entered next rooms that actually have the beams always on for reason. But! I thought it’s a bug too and I tried to pass it. And it worked! Like not always, but after several retries I came through, so looks like the beams are actually off sometimes though they should not be.