It’s likely both the helicopter and the jet received a TCAS warning. In dense airspaces, those alerts tend to trigger frequently, so there’s a strong chance they may have dismissed it. The CRJ crew might have been aware of the Blackhawk’s presence, but if the other crew had visual contact with the approaching traffic (the CRJ), they might not have felt the need to take further action.
They also changed the design of issue comments, but seemingly reverted it back to the old design in production? (If you check the first video on the blog you can see e.g. the profile picture inside of the comment, while the old and current version has it on the outside.)
No, I see the green, but I don't see any shaded green. Though this has probably to do that ISBNs are distributed in blocks and every pixel is either red or green?